How to install ceiling speakers

[Mattia95]

Hello everyone. I have a system with Denon x3500h 7.1 or 5.1.2 channel receiver with Focal speaker system. I would like to install a pair of ceiling speakers to take advantage of the atmos encoding otherwise with simple 5.1 the dolby atmos the system passes it to me in dolby true-hd.

My problem as you can see from the photos is the ceiling which is not flat but is going to raise towards the inside of the house.

I would like to install the same pair of speakers that I use as a surround sound, the focal sib.

In your opinion, what can I literally invent to be able to install these speakers on the ceiling in order to have them at the same height but above all not too high ??

Ceiling height from the right surround side 2.8 meters to rise. Ceiling height on the left surround side 3.2 meters to rise (the precise height depends on where it is best to install them)

Thanks


http://https://imgur.com/a/gWShHzd