We shoot flat in the yard most all year round. When its time to hunt we shoot off of my roof. 30 yards on my range finder. 20-25 feet up.
I always shoot bottom half. Not from poor form but shooting from that roof will teach you how to hit them. They all hear that bow, all I have seen are ducking before the arrow gets there.
Practicing as you would be hunting is very important. Same gear, same height.