There is a
VP100 in-wall.
That's probably what I would do.
Or put a VP150 on a short stand - if you are positioning the center "under" the screen, you might want some flexibility about aiming, placement, etc.
Agree with CatBrat about using 2 M2's. That's not going to be a very elegant install, either.
If you're doing THAT much HT in that room, make sure you get a good sub (either of the ones you mentioned are excellent choices). And you probably only need 5.1 (not 7.1) if you're sitting that close to the back wall. I'd get QS8's (the 4's don't save you that much money) and mount them on the back wall a foot or two in from the corners.
