pagination – Ajax and/or infinite scroll

Unfortunately no, there are no Display Posts-specific tutorials on implementing infinite scroll / load more via AJAX.

I did write a generic tutorial on infinite scroll that you could apply to Display Posts with some work (I’m not sure how you’d pass all the shortcode parameters to your JS code): https://www.billerickson.net/infinite-scroll-in-wordpress/

You could also try the Pagination extension: https://github.com/billerickson/Display-Posts-Pagination