Thanks JBG for the tips. I won't be going with in-ceiling speakers mainly because my room is sound isolated (new term for soundproofed). I have 2 layers of 5/8" drywall, attached to hat channel, isolation clips, and then to the ceiling joists.
1) I would probably end up cutting through the drywall and right into a piece of hat channel, or in line with a ceiling joist.
2) I am not too eager to put 4 holes into my ceiling for sound isolation reasons.
So for me, I am looking at somehow surface mounting on-wall M3s on to the ceiling. It will be a while yet before I get to that point, but I am just prepping now while I had some time home by myself.