I have both a hydrofarm and a herpstat. While the herpstat is more money, it has safety features to shut off the power if the probe becomes less than X or greater than Y. This way if the probe becomes dislodged and drops to an improbable temperature, it will not continue to supply full power. Hydrofarm lacks this luxury. I personally would consider running two hydrofarms in tandem. That way if the probe were to be dislodged, you'd still have a backup probe say poking into the enclosure as a fail safe. If the second hydrofarm is blocked by a reptile or something, it won't matter as it's only there as a backup for preventing disaster anyway, while your primary probe should be doing all the work outside of this. I am going to this system myself.
So, heat pad is plugged into hydrofarm 1, hydrofarm 1 is plugged into hydrofarm 2, hydrofarm 2 is plugged into the wall. I would not put both probes in the same place or they may become dislodged at the same time or in the same manner, but I would spread them out a bit. I've ordered all the parts to do this myself and will probably make a post in the enclosure forum after I have a chance to test it. If it works, it may offer a fairly safe method for 60$, not bad!.