If you are looking at a 6 hour or more run time, then you are going to need something with much larger battery storage capacity than a 1100 or 1500 rated UPC. Either that or a 1500 KVA rated UPS on each device might do it. Also, why do you need your DVR if your TV goes dead with the power going out? What good is any of it, if your TV is out and your computer is dead or laptop battery dies after two or three hours?
Steve, you not thinking this thing through.