Vampire Earth series by EE Knight. I really liked it because it's a different take on vampires, it uses them more to set up a post apocalypse type of scenario. They got into positions of power and manipulated a lot of events from behind the scenes pretending to be humans. Then they showed up in their alien forms as supposed saviors when shit hit the fan.
But it's all part of a plot to get to our juicy blood. They're like drug addicts. They can live off the blood from almost anything, but sentient life is richer and gives them a euphoric feeling. They don't do any of the actual fighting themselves. They have basically these enslaved husks called Reapers that they bio engineered, and they have a symbiotic link to them. They use them as foot soldiers, and it's pretty much impossible for humans to fuck with them without serious firepower or genetic enhancement.