I just got a free install in our new house. The installer put a slim dish up with one lnb and one cable into the house. I noticed that each room in the house has a capability of hooking up 2 tuners to a cable box and there is another cable that runs into the house for that. I only have two tv's in the house. Do I benefit at all by hooking up the other tuner to each dvr? I can already watch a show and record another at the same time. Also would I need a dish with two lnbs to do this? Thanks.