I haven't seen much about them but I think they're fun. Cool to have that effect in red.
My first thoughts were
Dwarven Recruiter and something like Vanquishers' Banner so you can just chain one after the other. Could make for an explosive turn with all of reds haste enablers and explosive mana options.
Spy kit is kind of fun with them just for extra buffs seeing as we only get 7 unlike all the rats that do the same kind of thing.
Depala seems like the best place for them. Dwarves aren't a particularly well represented tribe in Magic (though there are certainly some good ones) so she seems like the perfect home for them.
As Marshstepper78 says, Tiny Leaders Depala seems perfect as Boros is a difficult colour combination in EDH so the smaller deck size and life total seems like a great fit.
I can't see them
breaking any eternal 60 card constructed formats and I'm not familiar enough with standard to know if they have enough support.
I like you're Riku idea too MustaKotka. Creating copies and tokens seems like a great way to have fun with them too. Could be some Feldon / Brudiclad hijinx there too with
Infinite reflection and making an army of them. Maybe Kykar at the helm so we can
mirrorweave too. Make a butt load of tokens, turn them all into
Seven Dwarves. That sounds like fun jank to me.