i have mine taped down to the bottom of the inside of the tank. I really don't have any problem with this setup. I have noticed that my accurite temp probe is usually off a couple of degrees from my temp gun but may i suggest setting your differential for temp a little tighter it may kick on and off alot but it will hold a closer temp. I set mine at 3 degrees and you can go as tight as 1 degree according to my directions.if you have any questions on programing just re post them i will help as much as possible