Do you only feed the Dovii mollies, or is this a special occasion type of thing? The answer to that probably affects how, and how many people, will reply to your question.
If you want to feed exclusively live fish you'll probably get a few replies that say it's not a good idea - because it's probably not a good idea... I'd love to eat rib eyes and New York steak everyday all day - but not a good idea. You get the point.
If you're talking about how many 2" mollies can you feed at one time, on a special occasion, you may get more practical replies - simply because there are probably far more folks on here who only use feeder fish as a treat, rather than a staple.
I'm not against feeding my fish feeders - but I would never buy feeders for that purpose... Breed & grow them yourself so you can be assured they are not carrying disease/parasites.