The problem with 5 satellite feeds is that you need to run a cable to each of the inputs on the 2 tuner satellite boxes. You cannot use the DPP separator. Each satellite input needs its own DP21, with one feed from the 61.5 and one from the DPP44.
They will also charge you for this. The pentagon channel is not something dish will provide equipment for you to receive. If you happen to point to the satellite for some other reason (local channels) you get it as a bonus. The installer might charge you for the extra cable run to 2 tuner boxes as well. So, the installer would probably end up charging you for 1) the extra dish 2) the DP21s 3) running extra cables. You might be able to bargain with them, especially if it is a local dealer.