Where they put the "TV Backer" label is not necessarily in the middle of the backer. On my TT it was at the very top of the backer in both the living room and bedroom. I used the very smallest drill bit I could find and drilled a test hole to locate wood, just don't drill through the wall behind it too. I was over the top of the board with the first test drill and hit wood when I went a little lower. Easy to fill a tiny hole drilled with a color matching wax pencil. It will be behind the TV anyway. Limit screw length to no more than 1 1/2". I called the factory to see if they could tell me the size of the backer, of course the answer was "What?". I would guess it is probably about 18" square plywood and 1/2" thick. I got my mount(s) at Walmart. Make sure you check the bolt pattern and dimensions on the back of the TV. It will vary with the size of the TV.
2014 Palomino Puma 25RS 28 days in 2014, 47 days in 2015, 51 days in 2016 plus 6 more booked
2011 F-150 Supercrew 5.0 6spd, Me, Xyl and the 2 kids, BooBoo and Gracie (kittens)