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Sorry to say that but you're kinda gaming the aggregated reviews schema. Google states that for aggregating reviews, you're good as far as you're referring to a specific product, but you can't use schema markup to refer to a category. I mean you can but Google won't simply be showing your markup as that's not the way aggregatedratings are supposed to work, no one will get angry but you'll be getting no rewards for your work. Detailed info about review snippets here: https://developers.google.com/search/docs/data-types/reviews#review-snippet-guidelines As an alternative you may want to consider other options like aggregate price.

Agree with the points above with one exception.   Yes, you have to find a way to deal with duplicate and quality content at scale.  Yes, Robots.txt, nofollow links and index sitemaps are your friends.  I would not use rel=canonical unless I had to.  Better to get those extra pages de-indexed and then not let Google crawl the urls with the extra parameters to start with.  Why waste Google's time in crawling pages that are just resorted versions of another?   If you use the directives wisely you probably "only" have 200,000 pages worth crawling if you have that many sort parameters. Good luck!

Thanks for the response. In the old Google Places, if you managed multiple accounts, reporting was easy. An image is attached of what it used to look like. In the current My Business view, impressions and actions are gone from the summary page. I'm looking for a dashboard that will give me the same type of data for all 300 locations as the screenshot attached. Best, Adam bulk-google-places-listings.png