I think what is most important at home is that your neck and eyes are relaxed finding a center area.
Absolutely.
Almost every big screen I see — every home, every hotel — is mounted too high. Correct height is simple: center of screen should be eye level when seated. (A similar rule involving ears applies to non-Atmos speakers.)
For my 77” LG, i bought an Ikea stand that raises it up about 18 inches to the perfect height.