- Module performs with no producing any alter in the existing PrestaShop file making sure that existing customization and theme improve will not influence. You are able to change the placement of the modules on a similar website page. To see more, go through our short article on the subject: https://addons.prestashop.com/fr/seo-referencement-naturel/30904-balises-hreflang-automatiques-et-balises-canoniques-seo.html