In a prior house we rented with a fireplace we had a severe smoke issue and “damage.” I was starting a fire with some newspaper and due to the wind, pressure or something the smoke decided to NOT go up the chimney. The wall above the fire place was blackened as well as the ceiling. If there would have been a TV there it might not have survived.

With that experience behind me there is no way I would mount a TV above the fireplace.

However when we moved out the landlord complimented us on how well we kept the place up and the fact that we even painted the walls and ceiling. I decided not to mention that we almost burned the place down.