In additon to elisolution's answer above, this also checks no matter if we are literally on the house web site (not merely if the canonical was set or not). I examined this Answer somewhat and so far as I can see, it really works as anticipated. Usually, be sure to allow https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html