No need for 2 strips. If you are using an open rack or even closed rack in a room temp if 75 and below. Just use 11" heat tape on the 28/41qt tubs. This will heat up larger portion of the tub. While also giving you a 78-80 inside on cool side as well.
On the contrary ball pythons do NOT need a 80 on cool side. In summer mine get 82 but in winter their about 77-78 cool side. So i always tell people if you can maintain a 77-80 on cool side and 88-90 warm side your golden.