In additon to elisolution's solution higher than, this also checks no matter whether we are literally on the home site (not only if the canonical was set or not). I examined this solution somewhat and as far as I'm able to see, it really works as expected. Normally, make sure you https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html