TrustedReviews have looked at the Panasonic HD-PLC Power Line Network

The units are very different to anything we've tested before – looking more like a miniature UPS than the Devolo or Solwise units. Instead of plugging directly into the plug socket, these use a two-pin figure of eight connector. Although it adds more cable clutter, this is quite beneficial. The homeplug units that plug directly onto the wall can sometimes be tricky to fit because of their size, while these plugs are standard size. You can also tuck the units away out of sight, or make a show piece out of them as they look quite swish.

Panasonic HD-PLC Power Line Network Review