" GTM no-script code not found: possibly missing or not in " I try out to add the script inside the header.tpl but there is no segment. Update: Difficulty was solved. I just use Yet another addon and personalize hook to make it happen. Many thanks Ali Edited November 21, https://addons.prestashop.com/es/seo-posicionamiento-buscadores/30904-etiquetas-automaticas-hreflang-canonical-etiquetas-seo.html