You can have as many as you want.
It applies to both number plate payment and bizz
If you have two cars, a car and a motorcycle or something else, you can easily have a number plate payment for each vehicle. In addition, you can also have one or more bizzes on the same agreement with Brobizz.
You can only create one number plate payment per vehicle. This means that as soon as you have set up a number plate payment for a vehicle on an agreement with Brobizz, it cannot be set up on another agreement - unless you cancel the number plate payment first.