No, you can not do it that way at all.
First off, a 3x4 will not carry the 99 or 103 which is where your HD signals come from.
You would need a Zinwell WB68 if you ever need to put a multiswitch in there.
However, you would still need to run 4 lines from the dish to that switch eliminating the need for a 6x8 in your particular case.
That being said, you need to run 2 more lines from the dish to the room where you want to put the other DVR.