You specify the principal URL as the search engine can have issues figuring out which 1 should be the first URL.  The following tutorial will show you how to empower Canonical URLs in Prestashop 1.5. Hook Overview: This hook enables you to include any additional fields or information to https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html