diff --git a/src/config/wireplumber.conf.d/alsa.conf b/src/config/wireplumber.conf.d/alsa.conf
index 0143c6ed..39548a42 100644
--- a/src/config/wireplumber.conf.d/alsa.conf
+++ b/src/config/wireplumber.conf.d/alsa.conf
@@ -2,11 +2,11 @@
 
 wireplumber.components = [
    # The "reserve-device" module needs to be loaded for reservation to work
-  { name = libwireplumber-module-reserve-device , type = module, deps = alsa_monitor.alsa.reserve }
+  { name = libwireplumber-module-reserve-device , type = module, deps = monitor.alsa.reserve }
 
   { name = monitors/alsa.lua, type = script/lua }
-  { name = monitors/alsa-midi.lua, type = script/lua, deps = alsa_monitor.alsa.midi }
-  { name = libwireplumber-module-file-monitor-api, type = module, deps = alsa_monitor.alsa.midi.monitoring }
+  { name = monitors/alsa-midi.lua, type = script/lua, deps = monitor.alsa.midi }
+  { name = libwireplumber-module-file-monitor-api, type = module, deps = monitor.alsa.midi.monitoring }
 ]
 
 wireplumber.settings = {
@@ -14,22 +14,22 @@ wireplumber.settings = {
   # it requires that the PipeWire JACK replacement libraries are
   # not used by the session manager, in order to be able to
   # connect to the real JACK server.
-  # alsa_monitor.alsa.jack-device = false
+  # monitor.alsa.jack-device = false
 
   # Reserve devices via org.freedesktop.ReserveDevice1 on D-Bus
-  alsa_monitor.alsa.reserve = true
-  # alsa_monitor.alsa.reserve.priority = -20
-  # alsa_monitor.alsa.reserve.application-name = WirePlumber
+  monitor.alsa.reserve = true
+  # monitor.alsa.reserve.priority = -20
+  # monitor.alsa.reserve.application-name = WirePlumber
 
   # Enables MIDI functionality
-  alsa_monitor.alsa.midi = true
+  monitor.alsa.midi = true
 
   # Enables monitoring of alsa MIDI devices
-  alsa_monitor.alsa.midi.monitoring = true
+  monitor.alsa.midi.monitoring = true
 
   # These properties override node defaults when running in a virtual machine.
   # The rules below still override those.
-  alsa_monitor.vm.node.defaults = {
+  monitor.vm.node.defaults = {
     api.alsa.period-size = 256
     api.alsa.headroom = 8192
   }
@@ -43,7 +43,7 @@ wireplumber.settings = {
     # api.alsa.disable-longname = true
   },
 
-  alsa_monitor = [
+  monitor.alsa = [
     {
       # An array of matches/actions to evaluate.
 
diff --git a/src/config/wireplumber.conf.d/bluetooth.conf b/src/config/wireplumber.conf.d/bluetooth.conf
index d1cc5696..d977229f 100644
--- a/src/config/wireplumber.conf.d/bluetooth.conf
+++ b/src/config/wireplumber.conf.d/bluetooth.conf
@@ -4,7 +4,7 @@ wireplumber.components = [
 
   # If ifexists is given, the module is ignored when it is not found.
   # If nofail is given, module initialization failures are ignored.
-  { name = libwireplumber-module-logind , type = module, deps = bluez-enable-logind, flags = [ ifexists ] }
+  { name = libwireplumber-module-logind , type = module, deps = monitor.bluetooth.enable-logind, flags = [ ifexists ] }
 ]
 
 wireplumber.settings = {
@@ -81,9 +81,9 @@ wireplumber.settings = {
   # pipewire and wireplumber).
   # This requires access to the D-Bus user session; disable if you are running
   # a system-wide instance of wireplumber.
-  bluez-enable-logind = true
+  monitor.bluetooth.enable-logind = true
 
-  bluez_monitor = [
+  monitor.bluetooth = [
     {
       # Rules for matching a device or node. It is an array of
       # properties that all need to match the regexp. If any of the
diff --git a/src/config/wireplumber.conf.d/libcamera.conf b/src/config/wireplumber.conf.d/libcamera.conf
index 6fc0ec2a..bac3e522 100644
--- a/src/config/wireplumber.conf.d/libcamera.conf
+++ b/src/config/wireplumber.conf.d/libcamera.conf
@@ -1,12 +1,12 @@
 # libcamera device settings
 
 wireplumber.components = [
-  { name = monitors/libcamera.lua, type = script/lua, deps = libcamera_monitor.enable }
+  { name = monitors/libcamera.lua, type = script/lua, deps = monitor.libcamera.enable }
 ]
 
 wireplumber.settings = {
-  libcamera_monitor.enable = true
-  libcamera_monitor = [
+  monitor.libcamera.enable = true
+  monitor.libcamera = [
     {
       # Rules for matching a device or node. It is an array of
       # properties that all need to match the regexp. If any of the
diff --git a/src/config/wireplumber.conf.d/policy.conf b/src/config/wireplumber.conf.d/policy.conf
index b4edbda4..4c040c0f 100644
--- a/src/config/wireplumber.conf.d/policy.conf
+++ b/src/config/wireplumber.conf.d/policy.conf
@@ -60,18 +60,18 @@ wireplumber.settings = {
   policy.default.duck-level = 0.3
 
   # Whether to store state on the filesystem.
-  bt-policy-use-persistent-storage = true
+  policy.bluetooth.use-persistent-storage = true
 
   # Whether to use headset profile in the presence of an input stream.
-  bt-policy-media-role.use-headset-profile = true
+  policy.bluetooth.media-role.use-headset-profile = true
 
   # Application names correspond to application.name in stream properties.
   # Applications which do not set media.role but which should be considered
   # for role based profile switching can be specified here.
-
-  bt-policy-media-role.applications = [
+  policy.bluetooth.media-role.applications = [
     "Firefox", "Chromium input", "Google Chrome input", "Brave input",
     "Microsoft Edge input", "Vivaldi input", "ZOOM VoiceEngine",
     "Telegram Desktop", "telegram-desktop", "linphone", "Mumble",
-    "WEBRTC VoiceEngine", "Skype"]
+    "WEBRTC VoiceEngine", "Skype"
+  ]
 }
diff --git a/src/config/wireplumber.conf.d/v4l2.conf b/src/config/wireplumber.conf.d/v4l2.conf
index 76212b78..dd3fb6fa 100644
--- a/src/config/wireplumber.conf.d/v4l2.conf
+++ b/src/config/wireplumber.conf.d/v4l2.conf
@@ -5,7 +5,7 @@ wireplumber.components = [
 ]
 
 wireplumber.settings = {
-  v4l2_monitor = [
+  monitor.v4l2 = [
     {
       # Rules for matching a device or node. It is an array of
       # properties that all need to match the regexp. If any of the
diff --git a/src/scripts/monitors/alsa.lua b/src/scripts/monitors/alsa.lua
index cf7089fb..4c51cd7d 100644
--- a/src/scripts/monitors/alsa.lua
+++ b/src/scripts/monitors/alsa.lua
@@ -5,23 +5,14 @@
 --
 -- SPDX-License-Identifier: MIT
 
-local config_settings = Settings.get_all ("alsa_monitor.*"):parse ()
+local cutils = require ("common-utils")
+
+local config_settings = Settings.get_all ("monitor.alsa*"):parse ()
 
 -- unique device/node name tables
 device_names_table = nil
 node_names_table = nil
 
-function rulesApplyProperties(properties)
-  local matched, mprops = Settings.apply_rule ("alsa_monitor", properties)
-
-  if (matched and mprops) then
-    for k, v in pairs(mprops) do
-      properties[k] = v
-    end
-  end
-
-end
-
 function nonempty(str)
   return str ~= "" and str or nil
 end
@@ -152,7 +143,7 @@ function createNode(parent, id, obj_type, factory, properties)
   end
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.alsa")
   if properties["node.disabled"] then
     node_names_table [properties ["node.name"]] = nil
     return
@@ -254,8 +245,8 @@ function prepareDevice(parent, id, obj_type, factory, properties)
   end
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
-  if properties["device.disabled"] then
+  cutils.evaluateRulesApplyProperties (properties, "monitor.alsa")
+  if properties ["device.disabled"] then
     device_names_table [properties ["device.name"]] = nil
     return
   end
diff --git a/src/scripts/monitors/bluez.lua b/src/scripts/monitors/bluez.lua
index 907500a6..1dce4341 100644
--- a/src/scripts/monitors/bluez.lua
+++ b/src/scripts/monitors/bluez.lua
@@ -7,7 +7,9 @@
 
 local COMBINE_OFFSET = 64
 
-local config_settings = Settings.get_all ("bluez5.*"):parse ()
+local cutils = require ("common-utils")
+
+local config_settings = Settings.get_all ("monitor.bluetooth.*"):parse ()
 
 devices_om = ObjectManager {
   Interest {
@@ -23,18 +25,6 @@ nodes_om = ObjectManager {
   }
 }
 
--- applies rules from bluez-settings.conf when asked to
-function rulesApplyProperties(properties)
-  local matched, mprops = Settings.apply_rule ("bluez_monitor", properties)
-
-  if (matched and mprops) then
-    for k, v in pairs(mprops) do
-      properties[k] = v
-    end
-  end
-
-end
-
 function setOffloadActive(device, value)
   local pod = Pod.Object {
     "Spa:Pod:Object:Param:Props", "Props", bluetoothOffloadActive = value
@@ -281,7 +271,7 @@ function createNode(parent, id, type, factory, properties)
   end
 
   -- apply properties from bluetooth.conf
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.bluetooth")
 
   -- create the node; bluez requires "local" nodes, i.e. ones that run in
   -- the same process as the spa device, for several reasons
@@ -343,7 +333,7 @@ function createDevice(parent, id, type, factory, properties)
     properties["api.bluez5.id"] = id
 
     -- apply properties from bluetooth.conf
-    rulesApplyProperties(properties)
+    cutils.evaluateRulesApplyProperties (properties, "monitor.bluetooth")
 
     -- create the device
     device = SpaDevice(factory, properties)
diff --git a/src/scripts/monitors/libcamera.lua b/src/scripts/monitors/libcamera.lua
index 061eab62..1a7cdbf6 100644
--- a/src/scripts/monitors/libcamera.lua
+++ b/src/scripts/monitors/libcamera.lua
@@ -5,19 +5,10 @@
 --
 -- SPDX-License-Identifier: MIT
 
+local cutils = require ("common-utils")
+
 local config_settings = {}
 
--- apply properties from rules defined in JSON .conf file
-function rulesApplyProperties(properties)
-  local matched, mprops = Settings.apply_rule ("libcamera_monitor", properties)
-
-  if (matched and mprops) then
-    for k, v in pairs(mprops) do
-      properties[k] = v
-    end
-  end
-end
-
 function findDuplicate(parent, id, property, value)
   for i = 0, id - 1, 1 do
     local obj = parent:get_managed_object(i)
@@ -94,7 +85,7 @@ function createNode(parent, id, type, factory, properties)
   end
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.libcamera")
   if properties ["node.disabled"] then
     return
   end
@@ -131,10 +122,11 @@ function createDevice(parent, id, type, factory, properties)
       or "Unknown device"
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.libcamera")
   if properties ["device.disabled"] then
     return
   end
+
   -- create the device
   local device = SpaDevice(factory, properties)
   if device then
diff --git a/src/scripts/monitors/v4l2.lua b/src/scripts/monitors/v4l2.lua
index 07ce0ba2..195f2b14 100644
--- a/src/scripts/monitors/v4l2.lua
+++ b/src/scripts/monitors/v4l2.lua
@@ -5,19 +5,10 @@
 --
 -- SPDX-License-Identifier: MIT
 
+local cutils = require ("common-utils")
+
 local config_settings = {}
 
--- apply properties from rules defined in JSON .conf file
-function rulesApplyProperties(properties)
-  local matched, mprops = Settings.apply_rule ("v4l2_monitor", properties)
-
-  if (matched and mprops) then
-    for k, v in pairs(mprops) do
-      properties[k] = v
-    end
-  end
-end
-
 function findDuplicate(parent, id, property, value)
   for i = 0, id - 1, 1 do
     local obj = parent:get_managed_object(i)
@@ -84,7 +75,7 @@ function createNode(parent, id, type, factory, properties)
   end
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.v4l2")
   if properties["node.disabled"] then
     return
   end
@@ -121,7 +112,7 @@ function createDevice(parent, id, type, factory, properties)
       or "Unknown device"
 
   -- apply properties from rules defined in JSON .conf file
-  rulesApplyProperties(properties)
+  cutils.evaluateRulesApplyProperties (properties, "monitor.v4l2")
   if properties["device.disabled"] then
     return
   end