You can generally deduct insurance premiums for your rental real estate provided the premium is not for more than one year in advance.
See https://www.irs.gov/publications/p527#en_US_2018_publink1000218986
If you pay an advance premium for five years of coverage, you are essentially creating an asset that has a useful life of more than one year.
See https://www.irs.gov/publications/p535#en_US_2018_publink1000208862
