" GTM no-script code not found: either lacking or not in " I try so as to add the script in the header.tpl but there is no segment. Update: Challenge was solved. I just use another addon and customise hook to make it happen. Many thanks Ali Edited November 21, https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/30904-automatyczne-tagi-hreflang-i-tagi-kanoniczne-seo.html