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Would you install these? I wouldn't, and here is why:

  1. No place for grounding prong for three-prong cords
  2. Too easy for multiple line-line/neutral-neutral/line-neutral shorts, especially on the vertical runs
  3. Existing solutions to the problem it purports to solve without introducing new dangers (such as this squid outlet multiplier)
  4. Doesn't appear to be tamper-resistant

I cannot see this getting UL approval without at least a modification to add in a row for grounding prongs.

That's because it is for use in Japanese, not the US - http://en.wikipedia.org/wiki/AC_power_plugs_and_sockets#JIS_C_8303.2C_Class_II_unearthed
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