" GTM no-script code not found: both lacking or not in " I attempt so as to add the script within the header.tpl but there is no area. Update: Challenge was solved. I just use A further addon and personalize hook to do it. Many thanks Ali Edited November 21, https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/30904-automatische-hreflang-tags-und-kanonische-tags-seo.html