TV wall mount installation with wire concealment over TV Mounted Over Fireplace with Wires Concealed in the Wall. If you want to conceal the wires through the wall you need to first consider few things. Generally, concealing wires In-wall over fireplace is far different than In-Wall Vertical wire concealment. How should I run wiring for my above-fireplace mounted TV How should I run wiring for my above-fireplace mounted TV? Ask Question Asked 7 years attached with screws directly over the PS3 ,DVD, etc. I used the afore mentioned flat trough for the wiring from the console to the TV. I have seagrass wall covering which I Run TV Cables Above a Fireplace : 6 Steps (with Pictures Before you decide to install a TV above your fireplace, it is advisable to place a thermometer above the mantel and make a fire. Monitor the temperature over an hour or so and make sure it does not exceed 90°F. If the temperature remains below 90°F, it is safe to mount a TV above your fireplace.