Randy, this vid is old now, but still relevant. May give you some confidence in your decision before you cut holes.
https://m.youtube.com/watch?v=DFbqJkjfABQI have been doing a bit of research in the last few weeks about jumping to immersive finally. Strongly considering the x4300/x6300H. If you read the manual the custom setup options, including editing audyssey curves per channel,individual crossovers, seperate F/L eq options, seperate stereo LFE settings, etc it seems like a robust option.
I'll be watching your thread closely, as I did Nick's.