Installed the Rho-plate today - pics below
Very simple install, about 10 minutes
Side view - there is a lot of adjustment available to get the correct angle as noted above
I installed the rubber stops (included in kit) to protect against any pressure forcing the plate in to the bumper. This (poor) pic shows a top view, and you can see the rounded black half circles behind the plate.
The drawback is that it is not a simple quick disconnect, but it's also 1/3 of the cost of the MFest one. To remove, you have to take off the plate to remove the screw in the front of the spindle. You could fit a 3/4" wrench in behind and unscrew the spindle to remove the entire kit, but you'll have to be very careful when rotating to insure the plate does not rub/scratch the bumper.
As soon as I had finished the install, I immediately removed it and put in in the trunk of course.
Good kit at a good price