so for those of you that use radiant heat panels, where would you recommend placing the thermostat probe?

it is better to place it directly on the panel and adjust the heat according to thermometer readings? or is it better to secure the probe directly underneath the panel or on the actual basking spot and set the thermostat to the desired temp? any other ways?

i know multiple methods may work but would like to hear the reasons why the methods you use are chosen.

thanks!