Thank you for sharing the extra info! There are several cats here that have done full HT build-outs like what you are discussing. Hopefully they will chime in with some advice for you.
Do you listen to much music? If so, I would get you thinking about better front speakers and subs. My own experience with DT was lackluster at best. I do not have any experience with their in wall products though. That said, your front three speakers are the most important speakers in the system and care should be given to their proper set up.
Some have built a false wall with an acoustic screen for their projector, and place their speakers behind that. (Likely my favored approach vs in-wall application, but that’s just my opinion.
) Subwoofers are best setup strategically around the room to offer the best sound and impact. Every room is different, and there are many approaches. I prefer setting up multiple subs according to the Geddes technique: he advocates asymmetrical placements around the room which when done with measurements allows for very good flat and even bass throughout more of the room. A google search will yield some resources and videos if you wish to learn more.
For in ceiling Atmos speakers, I’ve seen many votes for the RBH options. Uncertain about in-wall surrounds and rears. (All my speakers are free standing.)
Hope this serves to get the conversation moving for you! Cheers!!!
