With that footprint limit, I would search less for a stand made specifically for that tank and more for something that safely supports the full loaded weight.
A few things I would check:
- Use the actual outside dimensions of the tank, not just the advertised gallon size.
- Make sure the whole bottom frame/base is supported, or add a flat plywood top cut slightly larger than the tank footprint.
- If it is the 16 gallon version, plan for roughly 160-200 lb once water, substrate, rock, and equipment are included.
- Avoid narrow furniture that can twist or rack side-to-side. A small cabinet can work, but it needs to be solid, level, and not particle board that will swell if it gets wet.
- It is usually fine if the stand is a little wider/deeper than the tank, but not fine if any part of the tank base hangs over the edge.
- Level the stand itself, not the tank. Shim under the stand if needed.
For your size range, I would look at small aquarium stands for 20 long/29 style footprints, sturdy metal utility stands, or a solid cabinet with a plywood top added. The key is less the exact label and more whether it is flat, level, water-resistant enough, and rated for the weight.