Well that’s kinda hard to say indefinitely, but if you added a pair of top fronts you would get sound effects from them obviously. But the Atmo”sphere” wouldn’t be intact, and the XYZ placement of objects would be ineffective too. I guess my short answer would be that it would be better to install the TF speakers but make sure you temper your expectations(zone should anyway of course lol), since that installation will very much limit the ability to be completely immersive.
I usually say some Atmos is better than no Atmos, so there’s that. Lol