I think this question had been answered already but yes, you'd mount the heat tape on the outside bottom of the terrarium.
I contacted Robyn at THG heat tape regarding proper airflow spacing for the heat tape and he suggested a 2-3mm gap so the heat wouldn't build up underneath.
Like Aaron said, the need for a RHP depends on your room temps. With that said, heat tape doesn't increase ambient temps. So unless the room where the terrarium is, stays between 75-84 F consistently, I'd suggest a RHP.
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