Though Gary Illyes, a Google analyst, thinks that engines like google might depend less on hreflang and more on automatic language detection Later on, for now, the tag is our best guess.  The JS redirect seems like a bit of a messy problem, but to answer your question: In case https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html