Hi Ian,
I only suggest using a load-more feature if it respects the current query string (the arguments in the browser URL). They usually do that, but not in every case, sometimes the load-more will try to load the next page without the query arguments, which may not trigger the search override. In worst cases they use a custom query via the ajax handler, in which case it’s not possible to override.
I have tried to enable that, and it is unfortunately using a custom search endpoint to load more results, not actually loading the next results page. It is not a bad practice, but it makes it nearly impossible to override as it is not recognized as a search query.
I suggest using regular pagination, it is usually much better in every aspec, as it does not require extra scripts and it is SEO and navigation friendly as well.