(Semi) newbie here with many, MANY questions!

[Mr. Misha]

I think at this point I'll try my luck with the probe one you linked me then. What's a recommend place to put the probe for accurate readings?

I'd put it right on the substrate and see how it goes. Even if your BP moves it, it's not a big deal because it doesn't control anything, like a thermostat would. Or you can suspend it down and let it hang almost touching the bottom and then tape it on the outside of the terrarium so it doesn't drop down further. Kinda like this:

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