I've decided to install the Bosch Park Pilot in the rear of my Passat myself. After doing some research
I found these to be highly recommended and that many car manufactures use them also. As you can see from the video it's not difficult. With the exception of removing the rear bumper cover it should be easy (I hope).
I've done my homework and I will post how it goes once I get the time to install them (maybe this weekend).