Hi,
Remember you can insulate the back, sides and bottom of the enclosure - this can help a fair bit with stabilising temps.
I know the standard advice is to keep the thermostat probe outside the enclusure but since you are using a ceramic that is less than ideal. A hot glue gun is the best way to secure the thermostat probe for the ceramic inside the hot hide - this will need monitoring as it has the standard problems of probes inside the enclosure - the snake can pee on it, sit on it etc which can effect the temps.
For the thermostat for the heat mat I would recommend placing it between the heat mat and the bottom of the enclosure then adjusting it to compensate.
And a major plus point to you for getting all this dialed in before getting the animal.
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