Do I need a separate Responsible Person for each product, or can one cover everything?

One Responsible Person can cover multiple products — that's actually the standard. A service provider can manage your entire product portfolio, not just specific categories. Some providers scale their fees based on portfolio size or how often technical documentation needs updating. A Responsible Person for ten simple products (e.g. various silicone kitchen utensil types) might cost €150 per year; for 200 complex products with frequent updates, closer to €500. That's market standard and should be clearly stated in your quote.