Currently all products that are not subject to the ChemVerbotsV. For rodenticides: Products with less than 30ppm active substance content.
Yes, if the product is subject to the ChemVerbotsV.
Both are possible, but may apply to different approved applications. Information on the product label.
The chambers of agriculture, for example, are good contacts here.
If the product is subject to the ChemVerbotsV, always both. Otherwise depending on the approval see product label.