Support Iceshanty... Get some great gear and forum goodies... Join The Iceshanty Hardwater Militia
I find it better to put it right in the ice so I don't burn my gear.
Above the ice on a crate. If you put it on the floor it makes the shack a pond.
Currently right on the ice, but I'm going to try a crate this year with the interlocking foam mats.