" GTM no-script code not found: possibly missing or not in " I attempt so as to add the script inside the header.tpl but there is no area. Update: Difficulty was solved. I just use another addon and personalize hook to make it happen. Many thanks Ali Edited November 21, https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/30904--hreflang-seo.html