Shawn....
Think of it like this:
Your monitors and mains are entirely separate systems. You need separate processing for each. If you wish to process both the mains signal and the monitor signal(s) you would have to have a processor which would have inputs and outputs for each system.
If you were running a house mix to the mains and one monitor mix that would require one (or more) channel(s) for the mains and one channel in/out for the monitors. Separate mixes, separate channels. If you're running the mains with subs and passive tops, you'd be using a minimum of two outputs for them. If you're bi-amping your tops, you'd need three outs (counting the subs).
There are DSP's which will do all that in one unit. The DRPA is not one of them unless you are running tops/subs/single monitor mix. And I assume your band will want more than a single monitor mix.
Edit:
Unless you're just running the mains mix to the monitors, you want to feed the monitors via auxes on the board. Each aux will have an output to feed the signal to the monitor (amps/speakers) using any processing (such as EQ) in between.