How To Build Citations For Multiple Cities Website?

In episode 237 of Semantic Mastery's weekly Hump Day Hangouts, one viewer asked how to build citations for multiple cities website.
The exact question was:
How to build citations for multiple cities website? Do you offer gmb verification for your local clients? I ask this because Iām not sure if this is risky and we should limit this to our own properties? Should we do this for a client with a service business that can serve multiple cities?
