Hmm... this is just my suggestion based on experience, but do NOT use those drawers for snakes.

The UTH can't be placed properly and still have the drawer open and close. The plastic is usually rather thin and flimsy and therefore easy to push out of shape. There are gaps that, with the addition of heat, could widen and allow escapes.

Better to get regular Sterilite tubs with lids. The ones with the handles that lock over the lid on the sides are great. Just add a bungee cord or two in the center and they're secure. And you can build a rack to fit them easily since the top lip is straight and smooth.