If you are going to plant them out then one per module as that will usually produce two plants. I put them out 2"-3" apart and never take more than one leaf per plant so that I get the beet as well (only me to feed and I'm a bit mean careful).
For smaller leaves, now called micro-greens I believe, I just put them in a standard seed tray with around a 0.25" ish gap as they are only going to get practice as plants Use the same for peas and broccoli when I just want leaves.
Some people treat them like cress and grow on paper I believe, never tried that so can't comment.
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
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For smaller leaves, now called micro-greens I believe, I just put them in a standard seed tray with around a 0.25" ish gap as they are only going to get practice as plants
Some people treat them like cress and grow on paper I believe, never tried that so can't comment.