I think you're making a big mistake if you have a preset height you want to put your stand, unless you are in a ladder stand. With a hang-on you want to go the correct height for the tree you are hanging it in....some trees need 20 ft, some need 8 ft. Let the tree, available cover, distance to the expected shot etc etc etc dictate the height, not a predetermined "want".
The only absolute I live by for treestands is that I will not set up without adequate cover, whatever that means for the specific situation.
Ryan