I'm in Canada and we've declined people from attaching anything to their balcony's railing. If they want to put a dish on the balcony, it has to be on a stand. My upstairs neighbour has one like this.

We've done this rule about attaching things to the building/railing because the building is actually two buildings one is a heritage building so nothing is allowed to be attached without prior approval of the heritage committee of the city. Since that building can't do it, we made the decision to do it for the new building.

We had to get permission to use a new type of metal shingle that looks like a traditional shingle but it has a 50 year warranty. Since that roof can only be serviced by one company in town (it has a steep roof like a church so only that company is actually able to do it) we wanted it done once and not have to worry about it. Even the method we used to clean the outside of the building had to be approved.