mine is right over the cat
No insulation. The big theing here is WHERE is your thermometer. If you have it on the stove top directly above the cat it will read really high, the rest of the stove not so much. The Infrared (IR) temperature guns come in real handy in determining the best place to mount you magnetic thermometer. Also, Condar brand thermometers seem to be the most accurate. Those rutland ones are barley accurate to 100 degrees sometimes......
I have no intention of "altering " anything ?