Saw one yesterday on a Lexus ES 300, same platform as Camry.
The hitch was installed by Eckhart, and the bike rack in the receiver
was Yakima.
Eckhard has a good reputation for installation - don't know if they are
available outside of Southern California.
The Camry bumper is vinyl plastic, over resilient foam over the actual
steel arced pieces.
The plastic bumper cover had been neatly cut back underneath and an
upright section of the hitch welded to the back of the two steel box
sections that form the rear bumper impact resistance behind the foam on
the outside.
There was another 1/4" thick steel leg that bolted to the underside
beneath the spare tire holder in the center.
Looked solid and professionally done - but not what I would call
simple.
Overall appearance was unobstrusive - all you could see was the
receiver.