If your business has more than 10 locations, it is qualified to be verified in bulk.
Verifying your location group is advised as this way you won't have to verify every single new location that gets opened.
In order to verify your locations in bulk, please note that each location should
- have the same name
- have a location id
- have the same website.
The user who verifies the Google My Business Location group has to be added as primary owner. See this article to know how to add users to manage the location groups and modify their admin rights.
For further information on verifying your location in bulk, please refer to the Google Help Center article.