Practical guidance for what is the right height for mounting a tv?.
Plan the viewing line before marking the wall
Start with the centre of the screen near seated eye level, then account for furniture, a soundbar and the viewing distance. A quick tape outline on the wall makes the decision easier.
You may also find this guide useful: how to choose a tv wall mount: vesa, weight and wall type.
You may also find this guide useful: installing a soundbar with your tv.
Practical checks for plan the viewing line before marking the wall
Measure the seat height. Mark the intended screen centre. Allow space for a soundbar or cabinet.