Many years ago, while living in Dorset, I met a guy with a Sierra, who carried a diary around, and every morning and afternoon, got someone to sign as a witness to his car's location.
He'd been getting parking tickets from a London borough, and despite denying them all, he was then being petered and threatened with prosecution. All the tickets were within a small area, but his suggestion that next time they find it, they call the police, was ignored.
Eventually, when the court summons arrived, he had to act. With all the ticket locations marked in his A-Z, he set off to London. Took a few hours, but found the car bearing 'his' plates. So he parked near it, and called the police. Armed with his registration document, VIN was checked, and at last the errant car was impounded. The council still refused to cancel the tickets, but the magistrate gave them a good telling off when he appeared, and was awarded costs. A lot of work though.
That's kinda the point of adding a little identifier beyond the plates.
It being the modern era, there will be literally no human input beyond perhaps taking the photo of the car in the process.
A lot of it is just a camera reads your plates on entry and exit and you get a nice photo of your car caught in the act.
But that photo is the easiest place to start when it comes to contesting it so adding a few bits to make your life easier and theirs harder is probably wise.
Obviously if you did it then it works in reverse...the police have been known to use exactly same things to prove the car they are prosecuting is not a clone.