Well, I traded in my QS8 side and rear surrounds for monopole M3 speakers for Atmos. The other problem that you could be facing is that if you went with Atmos, you want the surround speakers closer to ear level (a little higher), so there will be compromises either way.
Bumping a thread from the summer as I'm looking at also adding rear speakers to make a 9.2 setup (and the foundation for an eventual Atmos system).
I keep looking at the M-3 on walls as I like the flat profile. Wondering if M-22s would be even better or just too much for surround duty?
(Note: my other speakers are not Axiom and my current side surrounds are bipoles)
