I implemented something similar years ago for the publisher I worked for. Like 2006ish. It was after Katrina, I'd never had a full time dev job, and I created it as a POC to show to my employer that they could invest in me full time as a developer (I was helping put their magazines together when I wasn't working on their CRM).

I created a marketplace with finely tuned SEO for my employer to advertise (and charge) companies in niche industries. My SEO was better than the SEO of the developers who worked on their sites, and our audience was obviously much larger than theirs, so we ranked higher. Any time you would search for the company name or the product type in a certain geographic area, you'd find links to our pages dominating the search results.

One of the interesting things is the shenanigans some of these companies would pull to show up first in our local results. A whole lot of A1 and AAA names began to spring up as they decided that if the list was going to be alphabetical by default, then they needed to be the first in their category.