If a 90 degree hot spot is what you are going for, shoot for the surface temperature being 90 degrees. If the RHP heats the floor to 90, it will also heat the snake if the snake is sitting in that spot - because the snake is getting the heat (via IR radiation from the warm heat panel) that the floor would be getting otherwise. The air temp will always be a bit cooler than the floor because the air is mostly transparent to infrared radiation, so it gets warmed either by contact with the warm floor or by contact with the warm RHP itself. The warmer air rises and circulates away and draws cooler air into contact with the warmer surfaces.
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