I've had two different companies offer this for IPs we have been renovating when they would be empty for longer than 60 days. Funny thing was we were at the IP renovating longer each day than we spent at our own house, which was fully insured. Our own house was more at risk than the IP we were renovating.
The only thing was that the excess was $2K instead of $500 (or similar amounts).
I'm sure we were with CBA or Westpac at the time.
Just check some of the banks, or call an insurance broker who should be able to guide you.