I am wondering how effective having a set of height speakers instead of ceiling. if you think about it, it's just sound, and it comes to how good the decoder is inside the head unit to mix the sound to get the effect that you are looking for.

I am sure that the number of actual overhead effects in a movie is limited compared to a height ambient sound

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5