What state are you in? There are many working the australian market now and i have had experience with a few…. you would only use an advocate if you dont have the time to do the research yourself….
Try Loyds of London – they offer boarding house insurance. The underwriters are based in qld however access insurance in knox would be able to help you out. ph: 9887 2277 Best of luck – you're looking at a fairly high premium!