I just finished the install, took less than an hour. As others have said, I found the bolt hole a little higher than the 1 5/8" in the original post. I also used the actual plastic trim piece instead of a paper template to mark the cut-out, and I removed the two plastic rivets so I could peel back the trunk liner and not cut the plastic tabs. It was a little tedious trimming the hole till the plastic trim piece fit but it fits snug and looks good.
My German neighbor walked through the garage while I was in the trunk and gave me a funny look. I told him not to worry, I was just drilling holes in a my new car.
Thanks to everyone who contributed to this DIY.