I used to have Qs8s all the way around, but when I converted over to Atmos I went with 4 M22 onwalls for surround duty which give me a better experience for an Atmos room. I added 4 M3 InCeiling speakers for the Atmos duty. I would not worry about biamping not worth it and you won't notice any difference.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85