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I can confirm as well. I've run a lot of tests hoping this would help but it never moves the needle it's all about building high quality citations or cleaning up your already existing citations.

When you're doing off-page for Local SEO you're looking to build what are called citations. These are anywhere you're name address and phone number (NAP) information appear on the net. This is something I typically outsource. I have used both The Hoth seen here: http://www.thehoth.com/local/ and a company called Citations Pros seen here: http://www.citationspros.com/ Both are great companies and will help you in different ways when you get to different levels of your business. Not to give away to many secrets but I typically see Maps listings not ranking to well until they get around 100-250 citations built depending on the GEO and the niche.

Pardon me Keri it's late and I forgot my manners! made an edit in the comment to correct this. Thanks!

It sounds like the multi-location reporting your asking for here is close to what Report Pro does. Check it out here: https://reportpro.net/landing-page/

Edit: Full disclosure I have been good friends with the Report Pro guys for a long time and I have been helping them build out their reporting software. They originally helped me build Local SEO (Google Maps) reporting software for Voice Media Group and are now selling it to other local SEO companies.

I can confirm as well. I've run a lot of tests hoping this would help but it never moves the needle it's all about building high quality citations or cleaning up your already existing citations.