The last one you cannot see with the cover tab off. So, if you look at it directly it's on the inside towards middle. You need to pry the inside hatch cover a bit to actually see the last bolt. I loosen the little screw on each liner to pry it open.
You should be able to wedge in your socket after that. I just did this a couple months ago. After you get the last screws off, you can remove your rear bumper. Be careful though, start with the end first...then pull out from the middle of rear.
2005 MSM Sportcross: 4/10/09-12/4/13-Gone but Never Forgotten
2012 VW Sportwagen TDI SOLD
2014 Subaru Forester XT SOLD
2007 Saab 9-5 Sportcombi Aero SOLD
2015 VW Tiguan
1998 Lexus LX470