I do not know the dispersion pattern of the any of the M3 types. I think Mojo once mentioned something about a number when we were discussing in-ceiling imaging way back. From my experience, I think you’re fine with assuming a wide dispersion for both these speakers ... maybe someone else might want to comment on this.
Depending on the trade offs made on ceiling placement, your ceiling height, and the size of your listening area you might need to aim them. When hard wiring speakers (especially if in-ceiling) you will need to know your placement up front. You’ll have a good idea if you’ll need to aim them but ultimately you will decide it by experimenting.
BTW: One of the big advantages of using on-walls is that you can move the speaker a few feet with the only downside of how to hide the speaker wire (which is not much of a downside).
