In your RS2, use base mode and get the coordinate (use average fix). Using this you will get base coordinate that have been corrected by cors.
After that use same base mode but change the setting to “from known point” and fill the fix coordinate and record the raw data.
Set LORA correction in RS2 and M+ for RTK Mode and record raw data for M+.
So every coordinate record by M+ is already corrected by RS2 (base) and coordinate RS2 (base) is already corrected by cors using base mode earlier.
If you want to use post processing just use Raw data from base and rover, dont forget to change the setting in RTKLIB and fill the fix base coordinate