Hello @MarcoMatty
This is Jessica from ZIP Lock, a Shopify Postal Code/ZIP Code restriction app solution. Our app sounds like it might be what you are looking for. The app is designed to help Shopify Plus merchants set up rules to restrict or allow shipping by postal code/ZIP code and region. You can configure the rules to apply to specific products, collections, or all products.
The customer will see a warning at checkout that the postal code is not supported with the product name if an unsupported postal code or state was entered in.
We offer a 7-day free trial for you to try it out. Our app is checkout extensible, which means it requires you to be on the Shopify Plus plan to install it with the new Shopify checkout.