For ceiling mount Atmos speakers, what amp assign settings do you use in X2300 AVR as it has only two option available for Atmos (Front Atmos or Surround Atmos) ?I have also mounted Polk owm3 speakers in the concrete ceiling using SAFWE – SM03 - speaker mounts for the atmos setup. I am also using the same receiver as you have (Denon X2300) and able to get a good atmos effect by placing the speakers in the top middle position.