A:AnswerYes. My studs are 12" apart (don't ask me why). My mounting bolts were 24" apart. The wall mount piece allows virtually any distance between mounting bolts.
A:AnswerThe hardware included is massive! I'd think if you put only top center and bottom center in, and TV isn't constantly moved around, you'd be okay. I mounted a 43" and it is SO solidly bolted to the wall, I'd think there is room for you to do that and still be solid. You COULD get a piece of metal pipe strap at LOWES and put it between the top and bottom screws to add a third hole in between them.
A:AnswerYes it does fit your 85” Q60A 2021 television. Just be sure that you know where your mounting holes are located on the back. They’ll either be perfectly centered or towards the top of the tv. If towards the top like on my 85” Q70A 2021, you will need to adjust for this when figuring your mounting height. I’ve included a picture of my 85” Q70A mounted for reference.
A:AnswerI believe so but you'll have to be innovative with zip ties and you may have to get an IR extender seeing as the IR sensor is on the front of any receiver. If not, you will have to aim the remote behind the tv to do anything at all.