On July 6, 2018 at 09:36, Fins said...
But will it work if the surrounds and rears are in ceiling also?
Also, is 7.1.2 or 5.1.4 better?
It will “work”, it just won’t be as good as it should be. Using angled-baffle speakers for the surround channels, reflected off of walls will help.
What is the seating layout? I’m assuming you don’t have multiple rows of seating.