Understand that rel=””alternate”” hreflang=””x”” will instruct search engines to show the translated (localized) Model of a website page. Meanwhile, rel=canonical attribute will mark that it's not the authoritative or canonical Model. En ese caso, habrá que utilizar la rel=canonical aunque su efecto no sea tan notable (o incluso nulo) y https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html