" GTM no-script code not found: both lacking or not in " I check out so as to add the script inside the header.tpl but there's no segment. Update: Difficulty was solved. I just use A further addon and customize hook to make it happen. Thanks Ali Edited November 21, https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/30904-automatyczne-tagi-hreflang-i-tagi-kanoniczne-seo.html