It looks like Party Limit Begone is the only active one right now. I haven’t tried it in multiplayer myself (though that is supported up to 8 players), but something to note is that unlike in DOS2, there are some clear moments in the game where a party larger than 4 will break things; this can be handled easily enough in single player through sending people back to camp, but I don’t know how that would work in a multiplayer game. Also, because BG3 is gonna be receiving regular updates, your campaign will break until the mod author updates each time.

And yes, if you want challenging combat 7 people will make Balanced too easy