About the configuration of the site, you simply need to choose the choice "Custom made URL" and compose the custom canonical URL you want, you can established a special URL for each language of your respective store (multilingual store) You'll find 3 ways to include hreflang tags to webpages (by https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html