We currently have 4 HR20s, each with 2TB internal drives. 1. Can I use whole-home DVR to hook all 4 of them together? 2. I know it features a unified list. Can I sort the list so that I can see each DVR's storage separately? 3. If the list is unified, is the % of fullness of each DVR displayed separately in some way? 4. Other than signing up for the service, what other pieces do I need or should I just have D* do the installation for me? P.S. I actually have 3 now, but I want to plan ahead since I may get a 4th.