I vote bottom, definitely!

Quote Originally Posted by Deborah View Post
On an efficiency standpoint (heat loss vs no heat loss) belly heat is the best placement, side or back heat is most efficient when used in an enclosed rack/and or room with very stable temps.

As for the rest a matter of preference, my BP don't even have a hot spot in the summer (not something I recommend to anyone either)
Sometimes in the summer the room gets so warm I do end up turning my reptiles' heat off too