Here is a round plant stand that I made for my wife's succulent that is in a round pot.
It lifts the pot up to keep it off the shelf and has a lip for watering. It is goblet shaped and lets the plant dangle gracefully around it. It fits a pot about 5 inches in diameter, but there is no reason that you couldn't scale it to meet your application.
I designed this using Solidworks and printed my example using Hatchbox wood PLA for a nice natural look that I think turned out nicely.
The author marked this model as their own original creation.