When I first got my Camaro, I immediately had a
Passport 9500ci installed.
It wasn't cheap, but it has been worth every cent. The radar unit is installed behind the grill just under the license plate bracket, so it is hidden very well. The unit also comes with two forward facing laser shifters and one rear.
Here is a review of how it works.
The unit also has a GPS that is tucked inside the front dash. It remembers locations like automatic door openers and will store locations so over time, the false alerts are eliminated.