When mounting a 65 inch Television to the wall you should mount the 65 inch television high enough to where the center of the television is 65 inches from the floor.
So measure from the floor to the wall 65 inches and mark that spot and then mount the Television on the wall center of the television is where the mark is.
65 inches 5 feet 5 inches which is the optimal height for the 65 inches Television for the best viewing.