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I grow banana shallots 6 or seven seeds to a small module so the roots fill the module, makes them easier to plant out than larger ones where the soil seems to be looser. They then grow on to produce a clump similar to sets which split as they grow. Long Red Florence are also good for this method.
There is a school of thought that says plant small sets to get big shallots but I have no idea whether that is true or not.