There a few modules that let you export your PrestaShop feed directly to Google Shopping, but that’s only once a day! What if your products change price and availability more often than once per day? You’ll end up with many Google Shopping disapprovals.
Also, you can’t get granular in your categories, google shopping categories, and custom labels by directly feeding from PrestaShop to Google Shopping.
With Feedonomics, you can first export your PrestaShop products to Feedonomics, and then export to Google Shopping. That way you can feed multiple times per day and with performance helping optimizations.