I am working on my outside hide and I purchased a Zilla Thermostat. It says on the package not to install in terrarium. Is it because of humidity or getting wet or is it because it may read the wrong temperature? I was looking at the way people here seem to put it in a plastic box but with the holes in it I am sure the humidity would get to it anyway. is it ok to just put it on the back wall? Sorry for all the questions but I never used one before. Thanks