An insurer or person authorized to engage in the business of insurance in this state may include, in the premium charged an insured for any policy, contract, or certificate of insurance, a discount based on the fact that another policy, contract, or certificate of any type has been purchased by the insured from:
(1) The same insurer or insurer group, or another insurer under a joint marketing agreement;
(2) The Citizens Property Insurance Corporation created under s. 627.351(6), if the same insurance agent is servicing both policies;
(3) An insurer that has removed the policy from the Citizens Property Insurance Corporation or issued a policy pursuant to the clearinghouse program under s. 627.3518, if the same insurance agent is servicing both policies; or
(4) An insurer, if the same insurance agent is servicing the policies.