And the “upright high” head position causes just as many issues with comfort as too low a scope. A person should not be craning their face over to see through a scope, nor should they have an extended neck to be “natural” behind the scope either.
A vertical head position, sliding the cheek straight down on the cheek piece until it naturally stops, then set scope to that height. And in general, shooting with rifles that recoil, from jacked up alternate positions, at varied angles and slopes- lower to bore is better then higher to bore.