Interesting ... for some reason I thought they were aimable too. Not sure why ...
I had originally planned on using the In-ceilings in my ATMOS setup till Ian told me they did not image well because the driver is buried behind the flange. So now my plan is to use on-walls or in-walls in/on the ceiling.
I opened a support ticket to get a definitive answer.
For sure post back here. I was just about to pull the trigger on 4 in ceiling M3s for atmos. Heck, in their video on the M3 in-ceiling product page, they say they would be good for atmos.