Are you saying the speakers aer going to be enclosed in a hole in the wall so to speak. I am thinking that is not good for the rear ported M3s or M22s, maybe just using some W22s might yield better WAF for across the front or the new in-wall T series.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70