Get both and tell your roommates tuff !!
As for heat keep the hot spot around 32c which is just under 90f. Don't go above 90f. And then if it's needed put the other heat Mat on the other side keeping it at about 24-25c which is 75-77f. As long as your snake has those temps to go between the ambient temp does not matter.
If your really concerned then get a heat Mat that covers half of the bottom of the tub and has enough to go up both sides aswell which will heat up the ambient
92 -94 f is a little bit too warm.
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