Which Maestro Dimmer do I need?

We are wanting to add a dimmer to the recessed lighting in our living room. You can access the light from three locations (three different switches) in our living room. We really just need the dimming option at one location or switch. My question is do we have to buy the accessory dimmers for the other two locations if we just want to access the dimmer at one location? If so, do we purchase the single pole maestro? Thanks!