Thanks rebuy. I am looking at Denon or Marantz and solely concentrating on a 9.2 receiver, which can support Dolby Vison, HDR10, HLG, 4K video upscaling and HDCP 2.2 processing on all HDMI ports. With the 4x 280FA's obviously I want to take advantages of 4 overheads (or reflected overheads). ARC is important too if stability improves of this path to get SMART TV App Atmos content from the TV to the ARC port. Call me crazy but I do not find all the other add-ons of Airplay 2, stream with Spotify, Pandora, Tidal, Alexa as in anyway important to my listening pleasure.
AVR-X4500H 4K AV or Marantz SR6013 maybe.
I wasn't sure if the RP-280FA would be a good matching set to the RP-450