The problem you’ll have is that Atmos needs a bed layer and a height layer. If all the speakers are at the same(ceiling) height, Atmos won’t work. If you just wanted a nice traditional setup, you could put the surrounds in the ceiling, however it will be a compromise. What is the problem for surround placement? Just curious, since maybe a brainstorm session might come up with good results.
Also, what subwoofer is that? Can’t recall one with 3-8’s in it. Fwiw, subwoofer and 8” are imo, mutually exclusive and I would recommend shopping around if budget allows.