HomePlug on power line is a good way to get IP connectivity to areas where running cat5 is too hard. Better than using WiFi as a replacement for the cat5. You can always add an WiFi AP to the HomePlug, for that area.
The success scheme for HomePlug is to arrange the two AC outlet devices so their signals are not attenuated by co-located devices - like plug strips with filters/surge suppressors, or TVs with the same inside. This means you avoid using the same outlet, or plug strip. Or even choose an outlet on a different wall. On both ends.
And in the US, there's a chance that our two-phase power puts one device on phase A and the other on phase B - and inter-phase coupling of the signal is needed. This happens to some extent if you have long ROMEX cables carrying 220VAC (both phases) - it "cross-couples" along the length. It happens too inside a 220V appliance/stove but perhaps only if it is "on".
So some planning and experimenting is necessary. But once done, it works very well. Mine has run for years and is how I get IP to my HD TV's Ethernet jack, HTPC, and to the BlueRay player. Not sure I can do 1080p with this, but 1080i and Netflix are fine, at their lower bit rates. I don't have a 1080p capable TV.