Personally I use an Anthem receiver (an older MRX720), KRK powered speakers for the base (5) channels, Paradigm speakers for the overheads, and all crammed into a rather small-ish space (6.5m x 3.5m).
Honestly in this space the problem is mostly around buggy shite. Manufacturers have very little control over what companies like Dolby and DTS deliver them as black boxes, so integrating these tightly-controlled, proprietary decoders (Atmos, DTS:X, etc) and room correction (Dirac) and so on, is relatively difficult. Add in that things like HDMI 2.1 have had huge teething problems and it seems like every product drop from every vendor seems to be riddled with bugs for a year or more from release.
(I also have a comically oversized sub for the space, but that's a whole other thing)
My home theatre setup. I do not have either the space or money to have two separate Atmos listening areas!