Hi!
Our search plugin works by crawling your site for all of it’s pages, indexing the content of each page and allowing you to search through those pages and their content. This was not developed specifically with Post type in mind, it’s a connection to our broader service which works with WordPress as well as other kinds of websites.
It is possible to crawl multi-lingual sites with multiple projects configured in our plugin. A few lines need to be added to the init callback of the plugin to enable this, but SiteSearch360 support is happy to help with that.