Can you use a 3rd adapter (2nd extension) in another part of your house?
All powerline Ethernet adapter systems require 2 adapters; 1 connected to your router and another adapter where you want the wired extension. My question is: can you use multiple extension points by using a 3rd adapter (or more) in another location of the same house? If so, I assume all extension point adapters would be subject to the limitations of the adapter connected to the router. Would there be any other drawbacks? Would the security feature still work properly? If I live in a single family home do I even need the security feature?
I've been using the one main adapter with 3 other adapters / extension points in my house with no problem (4 total adapters). You're supposed to used the powerline adapters together on the same power circuit however, I'm using one downstairs and 3 upstairs all on different circuits and haven't had any issues. Your question about limitations is correct though.
As for the security question, to my knowledge, all of my security features, which are set through my modem as well as my internet security program still function just fine. I would always have security though. You can never be too safe as to what websites will try to do with your PC and what your neighbors might try to do to use your network.