Regulations for the Approval and Management of Employment of Foreign Nationals by Embassies, Consulates, Foreign Offices, International Organizations, and their Personnel in the Republic of China (Taiwan) Article 7

The Ministry of Foreign Affairs shall issue to each foreign attendant who is employed under these regulations a residence visa and an identification card for a foreign attendant to the head of a diplomatic mission/foreign office, which shall have a maximum term of validity of one year.
中文原文 駐華使領館外國機構國際組織及其人員聘僱外國人許可及管理辦法第7條
經本辦法許可所聘僱之外籍隨從,由外交部核發居留簽證,並發給外籍隨從證,其效期以一年為限。

English translation for reference only; the Chinese text prevails. Not legal advice.