Has this been done before, and if so, how was it installed? Any tutorials or advice are appreciated! Right now I'm thinking the radiant heat panel would most likely be secured to the lid of the tub.

I'm looking for a way to warm the ambient temps in my tub and after looking at alternatives like heating the whole room and CHEs I think I prefer RHPs because they require less energy and are less likely to burn the snake. Please let me know your thoughts or if you have any other tips for heating ambient temps in a tub.