An exact count and location of each:
NOTE: I'm unsure if what I have labeled as #16 is the correct number, but I know I used a screwdriver to remove these.
#16 (
x2) - Located at the top of the bumper at the wheel arch area, right above #12, both on left and right sides of the bumper, it's a bit hidden.
#12 (
x2) - Located below #16, on the gray piece of plastic in the wheel well, retainer clip, both left and right sides of the bumper.
#4 (
x6) - Located under the car, retainer clips going through tabs of the bumper along the whole underside of the bumper. 2 at each end, 2 in the middle attached to the plastic diffuser and 2 in between the ones at the end and middle.
#3 (
x2) - Visible with trunk open, two bolts on left and right side of trunk area. I used a 10mm socket to remove these.
Whenever I remove my rear bumper I mask off the parts that clip into the car as well as the quarter panels above to prevent damaging the paint from unexpected forces from pulling on the bumper.