The first one linked (my first post) is going to jump on your network and then extend that forward. You would place that where the signal starts to degrade to extend the network.
The Cisco one is indeed a homeplug. That's actually a better option because you're not piggy backing wireless signal. You're transmitting over the AC network in your home and extending. You can then plug in a true wireless access point that does nothing more than gives signal provided by the ethernet. Some of those require PoE so you may also need a power injector. It really comes down to how much you want to spend and what kind of quality you want for that expense.
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?