You specify the key URL because the search engine can have issue pinpointing which one must be the main URL.  The following tutorial will teach you how you can empower Canonical URLs in Prestashop one.five. PrestaShop modules we designed initially to solve the trouble of our personal business - https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html