" GTM no-script code not found: both lacking or not in " I consider to incorporate the script while in the header.tpl but there is no area. Update: Dilemma was solved. I just use One more addon and customize hook to make it happen. Many thanks Ali Edited November 21, https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/30904-automatische-hreflang-tags-en-canonieke-tags-seo.html