Above the fireplace is too high.
I had a similar dilemma when we moved into our house. I tried several options; above the fireplace, next to the fireplace and opposite. In the end I went with opposite because we all would have had to wear neck braces otherwise.
I find this odd - you've positioned the TV to take focus away from the fireplace. Would have thought the TV would be better in the corner from which the picture is taken.
Guessing there is something out of view?