I have used good quality Velcro for years now. With Velcro if the snake climbs over the unit it will simply come off the wall and nothing sticky, like tape, will be exposed to the snake.
Make sure you use good Velcro and cut it clean and crisp so it does not have any edges or corners that are not stuck to the wall and the unit.
Velcro also makes it easy to take the unit out for cleaning. It has worked well for me.
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