Shop-level reviews help you showcase overall reviews of your shop such as customer support, delivery, or website user experience. 

Shop-level reviews are activated if you enable the All Reviews Page. You can see shop-level reviews in an additional tab added to your All Reviews Page. Customers can submit shop-level reviews by clicking on the Write a review button on the All Reviews Page. You can publish, hide, reply, etc. to the shop-level reviews in the Reviews dashboard. You can also display custom questions from your custom forms.

You can import shop-level reviews by leaving both the product handle and product ID fields empty.