Wall mounting - where is perfect

[Stinky]

I’ve had my tv on a stand forever and think I might go for finally mounting my new one on the wall so I can mount my playbar under it.

How do you work out the perfect height? Is it as simple as where looks alright. Or is there a science to it.

Thanks

 

[Stinky]

Nice thanks. Now because I’m an idiot and will prob screw it up, and it’s a stud wall and a seriously expensive tv, I’m going to get a pro in to do it. They should be all over the science side of it I guess.

Anything I should watch out for?