[quotemsg=16667717,0,1008922][quotemsg=16667327,0,530844]On the matter of losing a wall outlet due to over lap[/quotemsg]
Several manufacturers now make HomePlug adapters that incorporate pass-through plugs. If you buy one of these models you won't have to buy an extra extender.
[/quotemsg]
Note the example of such in the article. Despite having a passthrough, the device overlapped the adjacent outlet and made it unusable for grounded plugs. This annoyance is something I've run into several times with powerline bridges and why I find short extensions handy to have on hand. There is also commonly a problem with furniture blocking the preferred outlet, for example, and a short one or two foot extension can allow use of the outlets while clearing the furniture.
This was also a common problem with wall wart AC adapters in times past but those usually merit protection and power strips with spaced plugs have become common. That wasn't always the case. In the 90s they were rare and Sega was trying to sell the combine Genesis game console, the Sega CD add-on, AND the 32X processing add-on. The three together meant three big wall warts had to be accommodated and none of the power strips then available would do this as the sockets were arranged too close together. At best you'd lose the use of some of the sockets. So Sega contracted a company to produce a Sega branded strip that was a little longer and had only five sockets instead of the typical six. In between each socket were letters spelling out S E G A in the blue font used in their marketing then. These are a bit of collector item today. I grabbed a bunch of them when the Good Guys consumer electronics chain was going out of business.
See, there's always a story.