(2) In lieu of the provisions set forth in subsection (1) of this section, the policy may contain a provision as follows: "OTHER INSURANCE IN THIS INSURER: Insurance effective at any one time on the insured under a like policy or policies in this company is limited to the one such policy elected by the insured, the beneficiary or the estate of the insured, as the case may be, and the insurer will return all premiums paid for all other such policies." [1967 c.359 §444]