So I started this hitch install last night.
There is a plastic cover on the bottom that must be removed. It contains ~10 plastic clips and ~6 10mm screw on bolts. The plastic clips are fairly easy to remove once you get the hang of it. You use a screwdriver to wedge between the head of the plastic clip and what looks kind of like a plastic washer. Once you do that with your screwdriver you can pull up on the head and leave the plastic washer flush to the tray and that will bring up the head a little bit. Once you do that, the plastic clip should pop out pretty easily by hand. It took me about 30 seconds to figure this out for the first one (natural instinct is to try to force pop the plastic clips out but don't do that).
There are 10mm screw on bolts on the sides and far end (middle of the car) so you will need a socket wrench (small one) or socket screwdriver to remove those.
There are 2 plastic clips in the middle and it is best to remove those last. The tray is not heavy though.
Removal of the tray took about 10 minutes so it's not difficult. I was able to do this crawling under the car without having to jack up the car and put the car on jack stands, etc. but if you do that, it will make life a little easier for you.
The next part was installing the actual hitch and I had some issues here because it just wouldn't fit right. It almost fit but was about 1cm too narrow I looked much closely and it appears that my hitch came slightly damaged so that's why it doesn't fit.
There are 6 big bolts to hold up the hitch and screw the hitch onto the car. The holes are already there and it looks like it's a perfect fit!
Since my hitch didn't fit, I ordered another one and I'm hoping that one will be better. In the meantime, I put the plastic cover back on again and will try again next week.
The plastic cover once removed.
The holes on the frame to mount the hitch.
The left side looks a little bent and damaged so it won't actually fit!
Top view looks like it's bent.