" GTM no-script code not found: possibly lacking or not in " I check out to add the script from the header.tpl but there is no segment. Update: Dilemma was solved. I just use An additional addon and customize hook to do it. Thanks Ali Edited November 21, 2018 by https://addons.prestashop.com/fr/seo-referencement-naturel/30904-balises-hreflang-automatiques-et-balises-canoniques-seo.html