I have two 8x8 4w UTHs that I will be using in a glass aquarium, and I have two ZooMed dial-style thermostats to run them. I'm wondering exactly how to secure my thermostat probes?

I will be placing them inside the enclosure, on top of the UTHs. I will place them under the substrate which will be bark on top of paper towels. How do I secure them and their wires so that they will stay put? I also have to be able to remove them for cleaning...

I guess I should ask if this is even the right location to place them

Much obliged for your help!