You specify the main URL because the online search engine could have issue analyzing which 1 should be the primary URL.  The following tutorial will demonstrate how to empower Canonical URLs in Prestashop 1.5. There are three ways to add hreflang tags to webpages (by add, we don’t signify https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html