The only way I would consider a second uth is if were on a lower temperature (80F) so your snake can thermoregulate. However as PitOnTheProwl mentioned, this won’t really change ambient temperatures. Yes, heat rises so you do get some lift but not like a che provides. I would look at insulating the tank by covering 3 sides with rigid insulation (hardware store) or foam board (Wal-Mart or craft store). You can also add this to the tank lid to further insulate, just protect it from the lamp. This will help retain the heat. For humidity you can try different substrates, large water bowl, or provide humid hides.
And as always, all heat sources need to be regulated by a thermostat. For uth the probe ‘should’ be between the uth and the bottom of the tank. The probe on my 2 quarantine setups is very thick, so I’ve taped it to the back side of the heat mat...so probe, heat mat, enclosure vs heat mat, probe, enclosure. The probe is kept tight to the heat mat with tape and the weight of the enclosure on top of it. I also regularly spot check surface temperatures with a digital heat gun. You always want to measure temp at the glass or cage floor. Snakes will burrow, so you do not want the heat tape to get hot enough to burn.
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