Heat pad under the tote, and the probe goes between the heat pad and the bottom of the tote. It's safe because you are using a thermostat, which prevents the heat pad from getting over the set temperature.
Heat pad and thermostat probe for it never go inside the enclosure.
I vote starting with a tote/tub setup as well for you- it'll be much easier in getting a happy, eating young bp.
I like the tote ideas as well after looking at the benefits it offers I think my original want for the aquarium route was more for me having something pretty to look at.
Are there proven thermostat options you guys or girls recommend