I had a similar issue in Venice….or should I say going over the bridge onto it.
I got a fine for speeding in a hire car and at the time recorded we had parked in a car park and were on a vaperetto.
It proved impossible to get anyone from the car parking co to respond and I reluctantly could not challenge the fine so accepted the hire companies charge on my card !
The Sunday Times had a small piece on this subject recently and I think some EU countries follow up and places like France don’t ? Cannot remember but still have it somewhere for reference.
Having done thousands of continental miles over the last few years and many since Brexit . I have not had any fines although I know I have triggered the odd camera. Every time I come home I ‘worry’ for a month or so - in that period now…. Getting a laser gun stop does trigger ‘payable fines’ in some countries we visit in our UK car and I would accept that - thankfully been a tad lucky on occasions.
Once I got ‘done’ but braked hard, swung left into a residential side road, new houses bing built and drove into someone’s open garage ……..true story, came out 15 mins later and drove past the police officers . I still pass this spot regularly when visiting this country . Hope this does not make me a bad person and I am now driving slower so perhaps it had the desired effect.
Best MM
PS Suggest you pay up if you are taking the car again.