Well I just upgraded to Atmos myself using a Denon AVR-730H AVR. There was no way I could mount ceiling speakers so I went for these instead

 

https://www.elac.com/product/a4-2/ which I run in a 5.1.2 setup.

 

Got them from Amazon on their free shipping to NZ deal :-)

 

I don't have a lot of Atmos content but I did download the Atmos trailers from Dolby's web site and I must say the audio is pretty good. When it rains I can hear the rain overhead. I think because my room is standard shape with straight walls and flat ceilings, the bounced audio works well. I have heard others have not had the same experience with upwards firing speakers. Now to find some good movie content.