I am on a mac and I can utilize multiple interfaces using 'Audio MIDI Setup' and making an aggregate device (with my 11r and my duet2).. Then I track into Reaper, even though I have ProTools11, and I have no problem utilizing any of the inputs. I have not tried this with multiple 11r's though, and I don't need/use the standalone editor while I track so I don't know how it would work out for someone who does..
BTW, Bob, Paul, where in Iowa? Iowa City here!