Houzz is the new way to design your home.
The rail goes straight to the wall. Looks better than boxed in at wj
Small office in closet
Tv over fireplace shouldn't be too high. Maybe no hearth?
Tv with hearth will be too high. Maybe keep hearth raised 8 inches and put tv on another wall for better viewing.
Tv height with hearth
Smaller tv no ledge and noraised hearth