Like Scribe mentioned,cover dictates what height is needed,You can over do it and Your shot angle is too steep!Good Cover and scent-control will let You get closer to the game Your Hunting...I shoot a nice 6-Point Buck out of a climbing stand about 10-12 feet off the ground because I was in a large tree with good cover in front and behind.
I did have my other Climbing Stand on the down side of a big hill....when the Deer came in from a higher Ridge Field they saw me right away...I was up high but from where they came it was a little above eye level so I either needed to go up higher or find a tree with better cover/leaves!