I live in an older house that thankfully has walls and doors - large open spaces would drive me crazy trying to 'tune' a system.
I have a 65" wall mounted TV above the fireplace and like it - no issue at all. I suppose that it could be a problem if the mantel was unusually high.
I also have a similar TV wall mounted above my equipment rack in another room, and again, no problem viewing it.
Maybe get a recliner so you don't have to stretch your neck for viewing....?