- Module functions without the need of building any change in the prevailing PrestaShop file in order that present customization and theme change will not have an effect on. GTM setup might be cumbersome and time-consuming – this extension comes along with packaged presets for 4 primary resources on the https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/30904-automatische-hreflang-tags-en-canonieke-tags-seo.html