Hi
As no one has replied, Ill answer as best I can.
1) Ive never heard of our used any of the radio mics or mixer youre talking about, so can only talk in general terms.
The output from the mixer needs to be matched to the input of the transmitter (level wise) So if its pumping out on a line level output, youll need to ensure that the radio mic transmitter inputs can cope with this. If not (and Id suggest its unlikely) you need to pad down the input using a line to mic level pad, or decrease the mixer output to mic level (which it may be able to do.
In general terms, radio mic Tx’s and Rx’s work on mic levels. Once youve paired up the inputs, things should be plain sailing.
Those brands are not present here in the Uk to the best of my knowlege.
Cheers
Peter