Wheels ordered, ABE available, why TÜV?

Servus, I ordered rims and this sentence was in the last e-mail from the shop: Quote: The report we have before us is an ABE. There is no supplement in the vehicle papers required in Germany. You only have to present it to the TÜV again. The expert will then issue you an attachment confirmation according to §19 StVZO for about 40,-€, which you always have to carry with you with the ABE. I have to go to the TÜV before putting it on or it is enough if I go to the TÜ V if they are already mounted on the car?