ConvertKit at its core is designed to be an email service provider (although they're adding their own ecommerce sales services soon), so the ConvertKit landing pages are designed for capturing email addresses. If you need a more general landing page for an Amazon product, I see there are some options when I Google for landing pages for Amazon, but I don't have any experience with any of them.

Aaron HockleyCommunity Guru
Photographer, Writer, Consultant