Up potting has too much benefit for the root system. I recommend putting them each in a small pot and then up-potting them after a week or so.
Good luck!
If they're autoflowers, put them straight into the 10L pot and don't transplant them ever... if they're photoperiods, go with the small pot and transplant when you get a nice root ball...
Good luck!
If you can put them in jiffy (peat discs) it's better...or plant directly in the final pot! Whatever you need, you can also message me privately, no problem!