The question is what's the budget? Ultra short throw projectors are more convenient because they can be put on the counter in front of where you'd hang the TV, but they're pricey. No need to hang it from the ceiling, or across the room.
Takes an hour and it will hang there for a few years.
I see the use case if you want to move it often though. Though as soon as you bump it you have to move it slightly again. Or let it run through autocalibration etc. For me it's more convenient to hang it to a fixed position where it can't accidently be moved.
