Helle SamiS, I do not think you can use a second location field on the same page, it should be confirmed.
Note that the country field with the complete list already exists.
I think the best solution for you right now is to create a city and zip code field. Just leave them free. Linking them to a data list in my opinion is not a good idea because it will be long and finding a city in will be difficult.
I think there will be a new solution in a future version on this subject. with the integration of OpenStreetMap, look here: https://una.io/page/view-discussion?id=781