Where do I put the remote probe of a thermostat in a snake tank?

Just Curious

New member
It's this thermostat http://www.reptilebasics.com/helix-controls-dbs1000_proportional-thermostat-grounded.html and it has a 6' probe. The tank is two feet high and the heat source (radiant heat panel) is on the ceiling of the warm side. There's a low branch underneath.
So where do I put the probe?

On the wall level to the branch? In the middle of the floor on the warm side? On the wall near to the floor?
THANK YOU IN ADVANCE!
 
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