I'd recommend going with onwall M3s for the surround and rear speakers, and the ceiling M3s for the overhead. I consulted with the Dolby Atmos guide for a 7.1.4 configuration, and it served me well.
Blade Runner 2049, Sicario, Alita Battle Angel, the various Star Wars movies, all had a terrific overhead sonic presentation, and I thoroughly enjoyed my upgraded Axiom speaker package. The only 'legacy' Axiom speakers in my set up are M80s and VP150 from circa 2005. I paid a good chunk of change for them, and did not think I needed an upgrade
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Obviously, there are qualified acoustic experts in this forum and they may have a different perspective than I have above.
Best,
edvacdude