Rear/Surround speaker recommendations for a JBL Projet Array setup

[flaggalagga]

I have a system with JBL Synthesis Project Array with a pair of JBL 800, center speaker 880 and the subwoofer 1500.

I wonder what rear speakers and ceiling speakers (in an Atmos set up) I could match with this system. The room is pretty small 15 m2 (square meters).

The surround speakers need to be fairly small.

 

[daytona600]

in wall/in ceiling speakers