I did one with in-walls as you mention. Tweeters ended up at 34” and no toe in. Sounded A+. The M5HPs sound best when tweeters slightly lower than ear level per my and Mojo’s tests. He likes em even lower.
I would not recommend toeing in onwall speakers because their frequency response is designed with loading of the wall. IE. flat to wall. In-walls/on-walls come with compromises, but in the end can still be fantastic.
Let them run in for 1hour while you are assembling the screen. What I do. They arent their best out of the box. But they sure sound impressive once they balance out. Mids takes a sec to catch up to the woofer output in my experience.
