The problem with such ceramic devices is getting the porosity right, and "right" changes depending upon the environment.
If you want to try something like that for yourself, you can always invert a clay flower pot and silicone glue it to a pot tray. Plant goes on the outside, and you fill it up through the drainage hole, which is now on top. Another alternative is unglazed clay sewer pipe, if you can find them.
Don't forget that the water goes away by evaporating, so that implies cooling, meaning that your plant better tolerate cool, damp, feet.
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