What is the correct Canonical for page 2+ on a Shop Category?

We are using an SEO scanner, and it constantly tells us off for having duplicate H1 tags, but it is purely down to the Category of products, such as T-Shirts, which if you have 10 pages.... would have 10 'T-Shirts' H1 tags.

I would assume this is resolvable via Canonical, but I've checked multiple websites. Some have the canonical as the parent page (minus the page number), and some have it as the page you are on.

What is the definitive answer on this?