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No matter the model, the verdict is the same - gotta be fairly unique content on each of websites. P.S. Look at any well established franchises - they have 1 website, where the products are shown, and you can choose your closest store/office and go get the product there. Then the locations itself have their own little subpages, which are unique to them - maybe their story, their staff etc.

You should write your description in a way that will make people want to click on your link when they see your description in the search results. But be aware that Google won't necessarily pick your description to show—it shows what it thinks best matches what the searcher is looking for. If your description is heavy on keywords that are not on the page and does not contain words that reflect the content of the page, it probably won't get shown.

Thanks Meisha, That's a great answer

Hi there! Great to hear you're baking this in from the start. Open Graph is good to include, Twitter also has its own markup and schema could be a real help if you haven't already considered it. Have you read this post by Cyrus Shepard? It has a pretty comprehensive list of different tagging and some good examples. Hope that helps!

It's going to be difficult for a single-page website to do much in the way of organic traffic. You're correct that optimizing 80 sites for the same keywords and phrases isn't going to be very effective; these sites will likely be seen as duplicates of each other, especially if they share the same design and much of the same content. Even if Google doesn't de-index some of their pages for being duplicates, you will still be creating 80 websites that are all competing with each other for the same phrases, which will make it harder for any of them to rank. What makes these 80 companies different from each other? Why would someone choose one one over the other? If they're local businesses, I'd lean heavily into local SEO for this - using MozLocal to make sure each company's local citations are claimed, filled out, correct, and consistent; and making sure that each company's name, address, and phone number are prominent on the site itself.