Back when I hunted places where I could leave my stand I would try to hang my stand "in the tree" -amongst the branches for cover. 15ft high was enough.

Now I hunt out of a climber, I don't get any natural cover unless I cut and wire it to my stand. More often than not I just go up 20-25 ft. Starting tomorrow, I'll have an ASAT 3D suit to help break up my outline.