Violet rings do work, in that they support the leaves, and the full weight of the leaf isn't on the pot rim. You can also use rings to 'nudge' a leaf into a better position.

In a pinch, you can also use a cheapo paper plate. Take a pot the same size, put upside down on the plate, and trace a circle around it. Remove the pot, and cut the circle like a pie into about 8 sections. You can then insert the pot into the hole. I tape the 'prongs' onto the pot to hold it secure.

For a smaller plant that wants to be a 'pot hugger', I trim down the plate and do the same thing.

Barbara