For heating: Yes you can use 2 UTH's as long as you have the thermostats to control them separately, but for tubs that small, the UTH on the warm end may keep the ambient temp up as well. Start with one and see how it goes...
For tubs: Why not just buy one of each size and punch the holes in both? If you get a hatchling, you will need the 20qt in a few months anyway. If you get one big enough to start out in the 20qt, then save the 16 qt. You can always find something around the house to store in it. Or use it as an excuse to get a hatchling later on...
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