We have a Qu32 and are generally moving to IEM, fed from the desk mix/group outputs.
Some people bought their own wireless IEM transmitter/receiver packs (Gear 4 Music own brand I think), but we find they are intermittently hissy. Much more reliable have been the Behringer PowerPlay P2 wired IEM amps. There is a dip switch to select stereo/mono and we run them all as mono. (Stereo is nicer, but uses too many channels).
For mixing we either have the engineer do the mix, or people use a phone app over WiFi. The A&H app is OK, and I would recommend that.I use MixingStation as it offers a lot more control, and I can adjust other people's foldback as well. In fact I can run the entire FOH, so we don't recommend it for most musicians.
Hope that helps. Anyone who wants to come over to Solihull sometime is more than welcome. We learned by visiting others, so happy to pass on what we know.