We recommend using pot feet for any pot that is going on a surface that will stain eg. Carpet, tiles or decking.
Even if you have a saucer, the condensation from the cold water sitting on a hot surface will leave the surface damp underneath the pot “ same as when you put a glass of water on a table.
If you choose not to have a saucer you can put the feet directly under the pot that way when you water, the water will drip out of the pot and dry up as opposed to sitting under the pot causing wood rot or stains on tiles.
We recommend 3 feet for small pots or if the pots are going in an area that gets no wind otherwise 4 pot feet per pot would be required.