Regulations Governing Enrollment in Postal Simple Life Insurance Policies Article 11

In the case that a single proposer has purchased more than two insurance contracts, the proposer may fill out a contract change form and designate that premium be combined and paid on the same date.
中文原文 郵政簡易人壽保險投保規則第11條
同一要保人立有二個以上之保險契約者,得填具契約變動通知書,並指定同一繳費日期,將各該契約之保險費合併交付。

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