Have been using DirecTV Series 2 receivers for my DirecTV satellite service. Want to switch to FiOS. I am reading that I can use the same Series 2 receivers for the FiOS service but I will only be able to use single tuner functionality. Is this correct? The same Phillips or Hughes Series 2 receiver that I used for DirecTV can be used for the new FiOS service? If so, do I need to use them in connection with the Set Top Boxes that Verizon rents you?