We researched this when we bought our flat screen and learned that it's best if it's at sitting eye level. Otherwise, it's hard on your neck. You also want to size the TV to the distance you will be sitting from it. We tried them out in stores and ended up with a slightly smaller one than my husband would have preferred, and a little bigger than I wanted. For our living room, it's "just right". :-)

It depends on the placement of your furniture. If you have to look to the side and up, then it is a problem (such as in your photo). Might be better to give us placement of your furnishings and distance from TV for us to ascertain the optimum height. Pictures always make the difference in being able to give some assistance and recommendations.

I know what you mean, If a fireplace is too high, it doesn't work. In this case, I purposely created a lower than usual mantle. By the photo I think you can see, the viewers are not ON TOP of the TV :-)
For more on this bedroom Watch this YouTube video:

Lovely transformation⭐️⭐️⭐️⭐️⭐️