FaitalPRO 4" 4FE35 as Dolby Atmos ceiling speakers?

Looking to add four ceiling speakers to my 5.1 to make 5.1.4 for Atmos.
I want to do this on a budget though, since I'm a couple years away from a total home theater build.
It seems the Atmos ceiling speakers don't need to work below 150hz and should be somewhat non-directional.
At $100 for four speakers, any reason not to try the 4FE35's?

I don't have Atmos experience yet, but based on what I've read, I don't understand why some people are going with large speakers for the ceiling.

FaitalPRO 4FE35 4" Professional Full-Range Woofer 8 Ohm
 
A 4" driver will be a bit beamy towards the treble - might be worth aiming them towards the listening area.

Apart from that, though, if they'll provide enough SPL etc then I see no reason why this shouldn't work.

Chris
 
91dB efficiency + 30W RMS power handling.
As long as I low pass the Faitals then I think I should be okay?

Was thinking of mounting them in a ported 8" PVC tube.
The mounting part would be cut at 45* angle, so speaker could be aimed to the listening area.
Then the top of the 8" PVC tube where it goes into ceiling, would be mounted so that I could swivel it around in a circle to get the best aim for left/right directionality.
 

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