It’s difficult for software to identify slop, since if there was a technical way to do so, the same methods would be used to generate more convincing slop.

You could give kagi.com a try (fake email address gets you 100 free trial queries) but idk if the output format will work with your browsers. Paid plans start at $5/month. It gives you more filtering options than DDG and so on give you, but I don’t think it’s better at detecting slop. Some people think it’s great and that it’s well worth the cost. I tried the 100 queries and thought it was a bit nicer than DDG but not that big a deal. YMMV.