There are 1-3 people in this department. For a company with a general size, one person is enough. If there are two people, one is responsible for company information disclosure and the other is responsible for foreign investment, public relations and legal related work. If there are three people, you may need a leader who is responsible for the coordination between this department and the management and board of directors of the company (there are so many people and few domestic companies).
As for the salary and treatment, there are great differences among companies, so you can refer to the salary and treatment of the financial supervisor level of the target company.
thank you