LG BX OLED + Samsung Q900A soundbar + XBox Series X/PS5

I currently have the LG OLED BX Tv and was thinking about purchasing the Samsung Q900A. Is this a good combination?

Also how would I connect a Nintendo switch and an XSX/PS5 (I don’t have one of these yet but will get one in the future)? Do I connect them to the sound bar and have the eARC from the sound bar to the tv. I don’t want to sacrifice picture quality as it is more important to me than sound quality/features.

Also, I want to make sure the soundbar is able to pass through 4K 120hz with VRR (if it can’t do this I am happy to wait for future models)

Im new to soundbars and sound features like atmos so would appreciate a simple explanation. Thanks!