You need to determine how far back behind your TV you want to place the LED light strip. You don't want it too far back because you want to see the backlight-- but you also don't want to be too close to the edge of your TV that you see the LEDs sticking out. ALSO you want the lights to the hidden back consistently behind your TV. You don't want it back 3 inches on the right and 1 inch on the left and 2 inches on the top.

To help ensure you position the lights consistently behind your TV, take some masking tape and draw a big square as an outline of your TV before you remove your TV from the wall bracket. After taping the "footprint" of your TV on the wall you can carefully remove your TV from the wall mount (Team Lift!).

Once the TV is removed, use the masking tape as a guideline to determine where to place the scrap boards that the LED tap will be "stuck" to. We marked 2 inches all the way around away from the masking tape.

So 2 inches in, we will place the board and the lights will stick to the boards, 2 inches behind the TV.