Don't put him on the porch. He can get cooked up, especially if the sun shines on him. The UTH (that heating pad) will probably be enough, but it needs to be controlled with a thermostat (not a thermometer).
Something like this:
https://www.amazon.com/Century-Thermostat-Controller-Germination-40-108°F/dp/B01I15S6OM/
Put the probe between the tank and the UTH. You can secure the UTH with some foil tape, so it sticks better.
Then adjust it so that a infrared gun pointed at it measures 90F inside the tank:
https://www.amazon.com/Etekcity-Lase.../dp/B00DMI632G
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