Mounting TV Above Fireplace

Make sure you have a heavy duty plywood backer board mounted to studs for your TV arm mount to attach.

Our TV is mounted about 45 inches above the floor and works fine

Google the available “tv mounts over fireplace pull down”

the swing both out AND down to be positioned lower over the mantle and/or fireplace to lower the screen height position 

Chief makes a great high quality TV mount

I put in a great Heat N Glow gas insert, puts out a lot of heat.  It gave minimum distances to flammable material specs.  You don't want to get your TV too close.  My TV was up high but tilted down a little.  When reclined in my chair with my head laid back, it was just right.  Standing in the kitchen was good, too.