Hi,
I appreciate your patience to this concern. Allow me to provide support to your concern.
You are correct that there is no way to access locations from an Affiliate Location Feed before it is connected to an account using Google Ads API / AdWords API.
As for the question below, I would suggest using the
Google Ads location extensions as it help users find your locations by showing your ads with your address, a map to your location, or the distance to your business.
"What is the optimal way to give users the choice which locations should be displayed for their acccount?"
You may check this
document to read more information about location extension in Google Ads API.
Also, you may consider using
location targeting if you want your ads to show on specific location.
Let me know if you have further questions.
Regards,
 |
| Ernie John Blanca Tacata |
| Google Ads API Team |
|
|
| |

ref:_00D1U1174p._5004Q2I04Aa:ref