All depends on the enclosure behind the mirror, I have a fairly closed box ( large air volume inside so heat isn’t an issue). And the inside don’t get condensation on it, and generally the part with the screen behind it usually gets warm enough so it doesn’t get foggy.

I wouls strongly advice against anything not glass when it comes to a bathroom mirror due to scratching. The bathroom mirror usually needs more cleaning than say a hallway mirror and the more you clean the more scratching will occur. So the harder the surface the better. And the coated side inwards the screen so you don’t accidentally damage it.