Negative
The surface temp should be measured near the floor since that is where the snake is. That's why I have a temp probe where your thermostat probe is and a temp gun for the actual surface. Where the tstat probe is does not matter as long as the tstat is set correctly.
I have a few RHPs in different cages. One is in my GTP cage which needs to be closer to the panel since he stays on perches. Letting it dangle allowed him to move it to much and did not keep it within the path of the heat which over heated the perches. This is also because of the build of these RHP and the distance it is from the cage walls.
Another is in my big blood cage. She has a way of flipping her hide around and moving her newspaper around. If the hide or crumpled newspaper covers or blocks the probe from the heat of the will over heat the surface. Having the probe mounted where I do is much safer for these types of snakes with my particular setup.