In additon to elisolution's solution earlier mentioned, this also checks whether or not we are actually on the house web page (not merely if the canonical was set or not). I tested this solution a little bit and as far as I'm able to see, it really works as predicted. Normally, https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html