The LNB issue, a quad can feed 4 tuners, either two dual tuners, 4 singles, or any other combination. Not sure if there are sat boxes with more than two tuners.
For a truly extensive setup, you would need a QUATTRO LNB and a multiswitch, which can provide multiple outputs (some switches can also use a quad LNB, signalling it to provide a quattro set of outputs). The common 5x8 (5th input is used to multiplex other stuff in such as UHF TV, FM, DAB) can drive 8 outputs from the 4 inputs
Alternatively, an Octo LNB (and 8 cables from the LNB!) would have enough to provide an average 2 feeds to each room.
The octo tends to be cheaper than the switch, and avoids the losses associated with a switch (if no amplifier included), but needs 8 runs of cable -
