Is this cage good for rats?

So I want to own rats in a near future and I'm searching for cages. I want to have a good cage and I found this one, which I think it's good (plus it's pretty cheap compared to most cages) but I'm not that sure about the materials...

I know some plastics are toxic for rats and I don't want them to have any problems, so I wanted to ask since I can't seem to find if polypropylene is safe.

I'd also want to know how many rats would be alright to fit there. My plan is to have 2, but if I can fit 3, maybe I'd have 3 👉🏻👈🏻