Inserting Content Between Rows Of Woocommerce Product Listings On Category Pages


We are wondering how best to insert content like an image or some other graphic in between every three rows of product listings on product category, subcategory, brand, and tag pages. Please reference the URL for an example of how these pages are laid out:

I've also made a low-fi mock up of what we would like to accomplish:

What would be the best way to accomplish this? Is there a way to 'break-up' these woocommerce product thumbnail blocks into sections for content to be added in between? Thank you for any help you can offer!

All the Best,