I currently have two HR20-700 HD DVR's and I have an HR24 HD DVR+ on the way. The DirecTV technician was also just out here (because of some HD reception issues) and said he replaced the existing LNB with a similar but newer one (still 4 cables coming from the dish) that is SWM compatible. Additionally, I have a home ethernet/wireless network with physical cable connections accessible by each receiver. Are the following reasons correct as to why I would get a SWM8 with PI, a 1x4 splitter, 2 DECA adapters (for the HR20's), and a DECA router package rather than simply connecting each receiver to my network via ethernet cable:

1) The HR20's won't do MRV without the DECA adapters,
2) Connecting an ethernet cable to the HR24 will disable it's MRV capability, and
3) Without the SWM setup, each of these dual tuner receivers would still need a second coax cable from the current switch in order to simultaneously record (or record & watch) two different channels?

If so, do three of the outs from the 1x4 splitter go to the receivers and the fourth one goes to the router DECA?

Also, even though only one cable goes to each receiver, does the fact that it is a SWM setup mean they are capable of using both tuners and, if so, does each receiver with it's one cable still count as 2 out of the 8 connections supported by the SWM8? And the router DECA connection counts as 1? Leaving 1 still available?

Hope that makes sense. Thanks in advance.