Choose an ecommerce SEO service based on your business goals, not a generic...

https://xeon-wiki.win/index.php/When_Should_I_Use_Canonical_Tags_on_an_Ecommerce_Site%3F

Choose an ecommerce SEO service based on your business goals, not a generic package. Ask how they handle faceted navigation and stockouts, what their reports measure, and whether any guarantees are realistic and clearly defined.