Optimizing GMB for multi-location businesses

When optimizing GMB for multi-location businesses, is it better to send all to HP, Landing Page for all locations, or send each GMB listing to the location page for that specific location? I have a customer with 8 locations. Their website has the primary location contact information in the header, all location contact info in the footer, and then individual location pages for each one. There are MANY explainable factors as to why their primary listing shows up in most searches while the others don`t, but I`m wondering if the destination URL for each GMB listing makes a difference or not. Thanks in advance!