Check with your insurance company.
However, my experience has been that a landlord's policy is less expensive than a homeowner's policy. For instance, in a landlord's policy, you're not insuring the contents. That's the responsibility of the renter.
On the other hand, I'd also suggest you look into an umbrella liability policy. It'll cover your rental property as well as other things you insure (primary residence, car, etc.) The cost probably will be $300 or so for maybe $2 million worth of coverage. It's well worth the protection. Again, check with your insurance company or agent.
Hope that helps.