Welcome Triggerhappy,
I don't have much to add except to say that M22's on swiveling wall brackets and a good sub sounds like your most viable option (without knowing specific details). I am also a long time Sonos user and love my Axioms as well. You'll find this ragtag group of forum members will be most helpful in suggesting solutions for your questions.

Cheers,

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1