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Hi  jgodwin, I think the default search engine on Safari would still be Google Search so you would be all right there.  And as ios and android  cover more than 99% of world wide operating systems (https://www.theverge.com/2017/2/16/14634656/android-ios-market-share-blackberry-2016) that would leave under 1% not covered. For the few Microsoft phones out there, in this 1%, you can off course optimize for bing https://ignitevisibility.com/how-is-bing-seo-different-than-google-seo/ Good luck, hope this helps

That part is probably configured by the Yoast plugin as it looks pretty much the same as the set-up that we have.

The Austin district won't show up in search results unless it has a unique URL. Will search parameters show in the URL when the visitor submits a search? If so, you can create an XML sitemap with precise URLs (including search parameters) for each district and submit it to Google. Unfortunately, I can also see the potential for duplicate content if more than one URL (different parameters) could be created with the same page content, and I don't see how you could solve the problem with canonical tags if the pages are dynamically generated.  You may be able to use the URL Parameters tool in Google Search Console to exclude duplicates, but that could add even more complexity to the problem. If you were my client (and we've worked with preschool franchises), I would make sure there was a dedicated landing page for each individual location, regardless of how many there are. A search function is fine for users, but a local landing page with a unique user-friendly URL that can easily be crawled is best for search engines.

Sorry, I meant 'disabled' not 'enabled' which is the default

There is a risk, but if the content is relevant its a small one. you could rank better also.

The_Sage answer is excellent in my opinion. Personally I am a modern user, but the large majority of the visitors to websites I manage are not. There are few ways of checking what kind of visitors you have using google analytics: https://www.google.it/webhp?q=google+analytics+users+scroll

I have extensive experience auditing sites of all types, including with and without unique URLs. I can tell you for a fact that if you fail to include a unique URL for each "unique" section, slice or "virtual" page, you will suffer regarding SEO and that will directly hurt your ability to have those "unique" variations of the site being found in search engines. Best practices dictate that if you use "infinite scroll", "window shading", multiple tabs of content within a single URL, search engines need to also be presented with the alternate "individual URL" version of each in order for them to properly identify the complete unique focus of each. This includes not only having a unique URL assigned to each "view", but also the related unique page Title, unique H1 headline tag and clickable navigation methods to reach those.