Mounting Monitor

Ok, so I finally got a "humidity monitor" fo Boudreaux's enclosure. Its just a simple Acurite from Walmart. Im just not sure how to mount it inside his enclosure. It has a magnet on the back, but no hole or anything where I could mount it using one of those suction cup things. I hate using those, they always fall anyways.

https://www.amazon.com/AcuRite-00325.../dp/B004K8RF10
Should I just use duct tape??
Im kidding, but really what should I use?

When I used those I just set them in a corner, pick it up whenever it gets knocked down.

I used Velcro strips, then ended up taping it on. :-)

I have one word for you: Gluegun. Or is that two words? Either way, it'll stick it to the side of glass or plastic and it's not impossible to remove, but there's no tape danger.

i keep mine in the middle tub near the front where i can always see it. If i want to monitor another tub it takes a second to move it. I like this setup as it allows for versatility; very rarely does my gauge get knocked over or moved.

I use a glue gun to mount all that stuff. If I need to move anything a just pry it off with a pocketknife.