You specify the first URL because the online search engine might have problems pinpointing which a person must be the main URL.  The next tutorial will tell you about the way to help Canonical URLs in Prestashop 1.5. Increase the indexing of your Prestashop urls in Google. This module https://bookmarkcolumn.com/story19011000/indicators-on-automatische-hreflang-tags-und-kanonische-tags-seo-you-should-know