Do you mean on homepage or at the category level?
Look through Baymard’s articles though it’s usually focused on carousels and ad type banners, not banners as a whole. A few that come to mind (not sure if your ecomm or not)
<https://baymard.com/blog/avoid-these-ecommerce-graphics>
<https://baymard.com/blog/ecommerce-homepage-ux>
<https://baymard.com/blog/homepage-carousel>