Hard to answer this without knowing the ambient temperatures in your home or room where the enclosure will be: For the most part, you want a warm side & a cool (unheated) side so a snake can choose the temperature they need. The exception would be something like a BP needing a fairly warm temperature range (78-80* cool side & 88-90* max warm side) IF by not heating one side, it will be too cold for the occupant (like if you keep the A/C to the extent that it ends up being 72* or something), then & only then you'd need some minimal heat source to keep the "cool side" at the proper range for your snake.
Otherwise, normally, the heat goes on one end, a second source if needed might be more to the middle, leaving an unheated part (about a third of the floor) for safety & needed thermoregulation for the snake- they need to be able to choose the right temperatures as needed. Make sense? So place the heat sources where they will get you the temps your snake needs- and fully test them for at least a few days before the snake moves in- you might need to move them around again.
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