Fair enough regarding the humidity then, that's something you might need to keep an eye on.
Regarding probe placement, you pretty much want them on the hot spots - You need to know if something is getting
too hot. Although, in all fairness the
thermometer is essentially "
information-only" and won't technically impact husbandry (although wrong placement will hide problems). For the
thermostat though, you will generally want that where the hottest possible point is that the snake may contact (if using ground heating anyway).
For example, if you were to use a heat mat under your tank then you will want the
thermostat probe to be in the hide that is over the top of the heat mat. Similar if you were using a Heat Cord/Tile setup. You get into a bit of a grey area with globes though. Depending on the thermostat's temperature ranges you may need to put the probe on the basking surface and then do a touch test on the
light cage (let it run for a good while, then make sure you can hold your hand on it for at least a minute without burning yourself or getting too hot) - A low wattage globe is useful for this.
If you want to check into this Heat Cord/Tile I keep mentioning then my response from last year to someone is probably worth looking at:
https://www.aussiepythons.com/forum/threads/temperature-troubles.222844/page-3#post-2518165
Some further re-iteration regarding placement in that same thread:
https://www.aussiepythons.com/forum/threads/temperature-troubles.222844/page-3#post-2518165
I was less experienced then of course, but the general idea is the same. The only real difference is that I feel belly heat is probably the most appropriate form of heating for a lot of
Morelia now. Back then I didn't have a carpet, and had assumed they needed heat higher up in the enclosure. Also, my Stimmie tank has more vertical space utilized in it now than it does in that picture.