That sounds like your standard "Service Plan" which will offer you as little as possible.
If you are interested in a car and want true peace of mind motoring, then ask for a quote on a full maintenance plan.
You don't really need a full maintenance plan if you have a warranty. The warranty will cover anything that breaks.
The only things a maintenance plan typically covers, over and above a service plan, are brake pads, clutches and wiper blades. So perhaps do the math on what these items are likely to cost and compare to the maintenance plan cost.