I have a 9.2.7 system and had a goal of getting the room to sound as close to a studio mixing stage as possible. I sent an e-mail to The Dub Stage https:\/\/www.thedubstage.com through their website and asked them for treatment suggestions. They responded back with a few questions and about my setup which is more in an Auro 3D style than straight Atmos. The owner of the Dub Stage copied the founder of Auro 3D, Wilfred Van Balen on his response and Wilfred followed up with me personally! Wilfred was very clear about treating ceiling reflections and managing bass. I thought about how to apply their recommendations as I wasn't able to put fiberglass panels or rock wool on my ceiling. Then I stumbled upon Gene and Anthony Grimani's series on youtube about room treatments and that helped a lot as for how to implement the advice I received. As for my height speakers I have 2 front height speakers and a center height channel mounted near the ceiling right above the corresponding bed channels. I have two speakers in the middle of the ceiling and facing straight down between my first and second row of seating. These speakers double as VOG for Auro and Top Middle for Atmos. Finally I have two rear height channels. My MLP sits the same distance from my front height speakers as my rear height speakers which are both angled toward the MLP. The front third of my room I placed acoustic panels made from polyester fiber that are white so they blend with the ceiling and light weight so I could affix them with alien tape.\nhttps:\/\/www.amazon.com\/TroyStudio-Fabric-Acoustic-Panels-Absorbing\/dp\/B0952RRCKP\/ref=sr_1_15?crid=1UPDCAT03QKVG&keywords=troy+studios&qid=1660683277&sprefix=troy+studios%2Caps%2C192&sr=8-15\n\nThe middle of the ceiling above the MLP and and in the back of the room off to the sides I used a pair of"geofusors" from Auralex , also very light so I could use alien tape. I filled the geofusors with polyfill so now they are a combo diffusor and bass trap. Wifred suggested having bass traps on the ceiling so this combo made it easy:\n\nhttps:\/\/auralex.com\/geofusor\/\n\nFinally Anthony Grimani suggested using diffusors on the ceiling near the back of the room. I borrowed the idea from the mixing stage of hanging an "acoustic cloud" of 4 Auralex Sustain Lens right behind the rear row of seats:\n\nhttps:\/\/www.amazon.com\/Auralex-Acoustics-Sustain-Lens-Diffusion\/dp\/B07DQ2T8C4\n\nThe end result was well worth the effort and many thanks to The Dub Stage, Wilfred, Anthony and Gene for their help.