You specify the first URL because the search engine might have issues determining which one particular must be the principal URL.  The subsequent tutorial will demonstrate the way to enable Canonical URLs in Prestashop 1.five. Improve the indexing of one's Prestashop urls in Google. This module AUTOMATICALLY provides, with https://bookmarkity.com/story19282015/the-ultimate-guide-to-hreflang-not-using-canonical