I personally don't run a plate on my car and just take my chances. If you're fed up with the tickets you're getting though, this works nicely:
It's a nice piece that I had on a previous vehicle of mine. It's totally worth it for a couple reasons. The most obvious reason, not getting tickets, but what made it worth it to me is that I've been backed up into several times, probably from someone trying to parallel park, but the no holes plate here takes the brunt of any small bump you might get from another car, taking the hit instead of your bumper, which is quite nice