The link appears to be more of a home warrenty instead of an actual insurance policy. If the house is older than 15 years I would try to get the seller to pay for a home warrenty for a year. I never pay for a home warrenty myself as most of the properties that I buy are short-sales or foreclosures and I just set aside some cash in case I have a major repair. I am always a bit skeptical of home warrenties anyway as I know a lot of people that have tried to make a claim and either never were paid or were only partially reimbursed.
As far as actual insurance goes, on a rental property you should be more concerned with liability and damage from events such as fire, flood, wind, hail, etc. You should either max. out your liability coverage (usually $300k per property) or even better take out an umbrella liability policy that can cover you, your home, your car as well as your investment properties. That way if someone sues you, there is enough coverage for your personal assets. An umbrella policy can go for a few hundred dollars for $1MM or more.
I usually choose a higher deductable policy since when you get a lot of properties your insurance costs really start adding up. It makes more sense to just keep a few thousand in cash to cover deductables than it does to pay an extra few thousand a year, every year, in policy premiums.
Also remember that your landlords insurance policy only covers the structure of the rental and not the contents. Make sure your tenants get a rentor's policy to cover their valuables in the property.