When I use my larger 5 gallon fabric pot, I just put 2 of my 3 gallon pot trivets under it....Seems to work perfectly fine. And I just print my stands. If you have a 3d printer, they are easy.
I like plant caddies...a little expensive but they roll and to empty the water, you pull out an easy little tray at the bottom. Made my life so much easier. Only good if you don't have height restrictions though.