Official comment
If I upload those corrected files, will I get a good solution through Maps Made Easy?
Yes, the outputs will get more accurate when more accurate data is provided.
How do I send the base station GCP point so that it is properly referenced?
If your corrections are being done already by other software the location of the ground station has already been taken out of the equation.
Be sure to make sure the DJI camera is doing the camera corrections. The images should not look like a fisheye lens took them. We do not do this correction for you and would just process the imagery as it is provided. The fisheye looking images don't work as well as the camera corrected data.