(That is probably a question better asked in the 'DirecTV Receiver with TiVo' forum here, since that is where the satellite users tend to be.)
However, the basic answer is that putting a 2 input multiswitch in the living room only works if you are using a single round dish and getting all your channels from the main DirecTV 101 Satellite. If you are using an oval multi-satellite dish you can't get all your channels from only two inputs to a multiswitch, it would take 4-6 inputs (depending on exactly which satellites you need to receive)
However, the basic answer is that putting a 2 input multiswitch in the living room only works if you are using a single round dish and getting all your channels from the main DirecTV 101 Satellite. If you are using an oval multi-satellite dish you can't get all your channels from only two inputs to a multiswitch, it would take 4-6 inputs (depending on exactly which satellites you need to receive)