I’ve done a few installs where we do an in wall articulating mount in the middle & 1 14” versabox on each side. It will fit behind a 70” TV so 75” is fine. I fit 1 Sonos amp & 1 episode sub amp a/ a Wattbox in each versa box. Plus another Wattbox in the mount. With the frame tv you would need to do the 20x14 versa box. So if you do 3 20x14 versa box I don’t see why you couldn’t do that. Make sure you have N IP surge though for power resets. Seems like a pain in the ass but it can be done. Maybe even 3 30” enclosures if it will clear with the tv and bracket.