Still pondering my options for the ceiling......

I can fit the round ceiling speakers to a couple boxes if I keep the back and front pairs a max center/center distance 48". The back row would be directly overhead. If I need the front and back further apart, then I'll need to go with the in-wall M3's.

Is 48" of separation enough? I've read the Atmos guide, and it doesn't really speak to dimensions. Just angles.