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I can't answer any questions about how many cameras you'll be able to view at once, because I'm relatively new to video surveillance gear, myself, and it'll depend upon your software in any event. But, as a retired Systems, Network & TelCom Admin with over 25 years experience building and maintaining networks (LANs, WANs, WLANs) for a living I'm going to suggest cameras <-> switch <-> powerline <-> router <-> powerline <-> NVR is probably not going to result in a happy outcome. First of all, powerline adaptors have highly variable performance, depending upon a variety of unpredictable factors. At the very least I'd obtain a pair and do network bandwidth, latency and error rate tests between Point A and Point B, then Point B and Point C before proceeding. I'd be surprised if you got sufficient low-error-rate bandwidth to support eight video streams. Secondly: It has been my experience that most routers (and I'm making the assumption you probably have either a common consumer-grade or cable company device) tend to be sub-optimal as network switches. Particularly common WiFi routers. In my opinion, based on experience: Switches to switch, routers to route, and WiFi access points to provide wireless access. Avoid WiFi and powerline where wired is feasible. As to WiFi vs. powerline: Whichever works best, which is highly site-dependant.