The problem with that is the snake cannot move it. Sounds crazy I know, but snakes actually can and do move hides a few inches across newspaper. When under the hide they inch up closer to the cool, or hot, end of it and it moves in that preferred direction.
Believe me, having them partially buried in substrate doesn't stop Yigg from scooting them around. He can't push them across the tank or anything but he does fine when it comes to thermoregulation. So not actually a problem at all !