Configuring Rover F9P GPS for RTK Using Ardupilot

When Use the RTK_INECT feature on mission planner, I know it configures the ’ Stationary Base’ GPS automatically to output the RTCM messages for the corrections. However I suspect it also does something else for the Rover GPS for the RTK to work because when I send my own RTCM messages over MAVROS, the Rover GPS only responds if I first go through the RTK_INJECT process using Mission Planner(then disconnecting coms so I can use my mavros node instead).

So my question is, is there a way to automatically configure the Rover GPS for RTK to work upon boot without RTK_INJECT process in mission planner?