My client's website structure is like this: homepage.com/city/service-in-city

Their most demanded service page is like: homepage.com/city/main-service-in-city

I am a bit confused which page should I link to the GMB profile? Here are the three versions: homepage.com/city/main-service-in-city (as it is the main service) OR homepage.com/city/ OR homepage.com/

Please help me out with this.