I finally had some time granted to me on my birthday to wash and wax my car! Someone else had noticed a few days prior that my bumper panel looked like it was sagging. I noticed it too, but never enough time to actually check it out.
While waxing, I finally looked underneath and noticed the bumper was hanging down and one of the attachment points melted on the exhaust. I did not have any attaching hardware on the studs in the back, so I am printing some out of ABS to fit. While putting the first test nut on, I noticed another couple of studs protruding from the bottom of the trunk panel on either side of the muffler. I also have an unused hole in the rear of the splash guards. Neither side has anything installed, but I assume that something should be there.
If anyone has any pictures of these locations, or any underside pictures at all, I would really like to see them. I will try to share my prototype body panel nut, if anyone is interested.