I am currently using only a 100watt 24-hr red lens bulb for heating my 10 gal tank. With this, I have a Digital thermometer/hygrometer, but I am having some trouble figuring out where/how to place it.

I want it to be secure without really having to use tape and as for the sensor, right now i's buried under the cypress mulch bedding so that my BP wont mess with it. Obviously, this isn't giving me the best reading, however, so I was wondering if anyone could give me some helpful advice!