Mercer is serious about its mission to produce physicians who stay in Georgia and work in rural communities. I applied to Mercer regular decision this cycle and got WL; I have consistently talked to other folks with weaker stats who were admitted this cycle but most of them lived in Georgia most of their life and/or were from rural areas. (There was an occasional Atlanta person but that was usually accompanied by a very strong MCAT score). How "strong" my ties are to Georgia, especially to rural areas, came up in the interview TWICE. My father's entire family is from rural Georgia and has lived here for centuries. We moved back to Georgia (my parents met out of state) in the late 90s and I went to middle school and graduated high school in Georgia; my parents have lived here ever since. After college and working out of state, I moved back to Georgia in early 2019. Again, how strong my ties are came up twice.
If you are originally from a rural place elsewhere in the south (AL, MS, TN, etc.) you probably still stand a decent shot. You stand an even better shot if your fiance is your legal partner by the time you apply. And you stand the best shot if you currently live in a rural area in Georgia.
I have applied to another SMP but likely won't apply to Mercer's because I talked to two former Mercer MSPCS students and neither got in after doing the MS; this was pre-linkage. One spoke with one of his professors after and they said, "We are trying to give rural students a chance." The MSPCS program won't change my profile or their perception of my ties to Georiga so I won't be applying. However, as neurotickombucha87 and some of their classmates proved, some folks definitely make it through. I wish you the best of luck.