Foreign countries have applied for patents, but there is no application at home, so there is no protection at home.
2. If the product has been listed abroad, it constitutes public use, which destroys the novelty of the patent. If you apply in China, you will not be authorized (utility models and designs can be authorized without substantive examination, but they will become invalid). The only possible solution is that the filing date of foreign patents does not exceed 12 months (6 months for design), and you can apply for a patent in China to claim priority.