You specify the main URL since the online search engine can have difficulty pinpointing which one must be the primary URL. The subsequent tutorial will explain to you the way to help Canonical URLs in Prestashop one.five. The JS redirect sounds like a little bit of a messy situation, https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html