You may as well include the canonical URL in the HTTP header of the web page (this aspect is obvious only by Internet browsers) There are 3 ways to include hreflang tags to webpages (by insert, we don’t suggest put into practice, we’ve now protected that):  Each are valid, Doing https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html