I have a 55 inch flat screen TV I want to mount to the wall. The TV itself measures about 49 inches long & 30 inches tall (top to bottom). The room has a 9 foot ceiling. Is there some kind of average distance to set the TV from the floor to the bottom of the TV. I think the wall mounting bracket can be titled somewhat which is good I guess because the main viewing lounge sofa has fully reclining features. Wow, how soft I've become in my old age. Thanks for the advice.