The sucker will also fall off. I'm from the wedding company. I tried a sucker used by a guest, but it needed to be taped. It won't stick at all on rainy days because there is water. You can do it. If it rains, park your car in the indoor parking lot (shelter from the rain), then dry it with a dry cloth and stick a lot of tape (note: make sure the car body is dry) to stick it, and then leave it to fate.

Of course, the place where the department can be used must be tied, and that's all.