i had to progam it manually because I had the same problem. I used bome midi translator to sniff the midi message from dLive and put it into live professor. midi momitor maybe also works.
seems like stereo groups are true stereo busses with one channel going to L and the other channel going to R, no panning. you can always pan the groupmembers accordingly.
in my opinion 1 mixrack will have too not enough power to feed 24 stereo IEM busses and fullfill a decent number of busses for groups, fx, matrices both for mons and foh. better get a second mixrack and keep mons and foh separated processing wise.