This was the choice to make in my theater as well, and I went "unobstructed" with rear DSP33s equal distances behind the prime listening/viewing area. They are mounted above, about 8' apart, facing down (and forward) towards the seats where a central listener's ears would be one point of a 8' x 8' x 8' triangle. They extend through slots cut in the soffit above which my projector is installed, so people walk under them when entering the 17' x 28' space.

Server: Audiolinux Roon NUC w/HAF room correction and crosstalk cancellation
Theater: 218, Allo Signature, miniDSP, HD621, C61R, DSP5200SEu, 420, 33, NHT subs
EtherREGEN w/Finisar fiber, Shunyata Denali
Living Room: RPi4 Diretta Host & Target, Ghent USB > Singxer SU-6 > AES NA M-Links > DSP9
Shunyata TritonV3, LHY lps, Farad Super3, Stack AUVA feet