Heres the thing, I can successfully use hot area temps, from 115F to 180 or more? It depends on the monitor, the size, and most importantly, the rest of the options.
About very high hot areas, these are indeed useable, but they also can be used wrong. That is any temp above 100F can kill a monitor. The hotter temps require a clear ability to get cool when needed. IF not, it may prove fatal.
We can use extremely hot areas, because we give our monitors depth of substrate they can escape to. This is how they work in nature. If you have a cage that only has a couple inches of substrate, where does the montior go to get cool?
You must also consider that monitors picking temps by moving, left to right or back and forth, is not natural to them. They normally go up and down to achieve desired temps. They control their temperature using a mass, then move to hotter areas when needed.
Also, they use behavior to use the whole range of behavior. Therefore, no one can really tell you what works, your monitor will tell you what works.
My advice would be to pick a medium temps then safely play with it. FR