I understand what you're saying.
You won't want to flush mount the M22 as it is a rear-ported speaker that needs some room to breathe. Using a bracket that provides some space behind the speaker is an option - apparently you need a minimum of 2".
It seems to me that mounting them on the angled part of your ceiling is a bad idea. They would be way higher than your TV image - not locked in to the screen at all. And for music it probably won't seem very natural. I would look for a lower spot to mount my speakers.
