The Hopper Duo certainly makes this installation easier than it would be if you had a Hopper 3 instead. The Hopper 3 would require a DPH42 switch and a Hybrid Solo Hub. You might even have to chain that switch with a DPP44 switch to be able to add the other stand-alone receivers, or at least the ViP211k.
However, with the Hopper Duo, you would not need any of the above. Just run a cable directly from each output on that LNB to each receiver, and you are all set. The Hybrid Solo Hub would only be needed if you ever want to add a Joey to the Hopper Duo. Even that is apparently not a requirement, though, since my installer used an older Solo
Node and a Hybrid Tap to add a Joey 3 to my Hopper Duo, and it worked. I didn't test to see if it would have worked with
only the Hybrid Tap, and no Node at all. The bad part about the Solo Node is that it ties up two of the cables coming in from the dish. So in your case, you would still have to add some kind of switch (such as a DPP44) if you wanted all three receivers (Hopper Duo, Wally, ViP211k) and a Joey all hooked up that way. This is why the Hybrid Solo Hub is easier to install, since it only needs one cable coming in from the dish.
I know my explanation above made the installation sound a lot more complicated than it actually is, but I wanted to make sure I covered all of the bases.