Hi McHornson,
Welcome to the forum!
Can you tell me more about the features you would like to see in the Emlid Flow?
We haven’t tested RS3 with the Surpad 4.0 software, but starting from the 32 firmware version you stream the NMEA GGA and GST message with the tilt compensation:
You can set up the base and rover in the Emlid Flow application and stream NMEA from the RS3 rover to the SurPad. Does that work for you?