if you all have APs, it might be cheaper booking the DCR for one adult on a package (and any free children ie kids under 7) and then you can add the other members of your party to the cabin when you arrive. You only pay at the most 2 euros per adult per night booked if you do this.
The room only AP price you get over the phone with Disney may be more expensive than a one adult package, so get the price for the one-adult package online before you phone

.