Iv built a new space for my Snake. I built a 48" long 12" high and 14" deep terrarium. I want to do this right the first time, so I have questions about properly heating. I understand that 1/3 of the cage should be the hot area, and I wish to heat that area using heat tape and a thermostat. My terrarium is glass bottomed.. How should I go about doing this?

2 rows of 6" tape? one 12" row?
Herpastat? What are my options??