When I first put in my order for the whole home upgrade...I tried to get 2 and while the CSR I talked to was very nice and gave me a HELL of a deal...he told me that 2 HR34's in the same cloud would conflict with each other. I accepted it at the time..
As far as the SWM is concerned, there is an SWM LNB (installed at the dish) that has an absolute maximum capability of 8 tuners. There is an external SWM8 and SWM16 which can support 8 and 16 tuners respectively. These require 4 coax from the dish to the external SWM device.
If you have the SWM LNB (single coax from the dish), then you can't support two HR34's with it. You would have to change the LNB and add an external SWM16.
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