This Co. makes electric superchargers, and are very well established
www.boosthead.com
They acutely used a KA24DE from a, or better yet used an altima for a test car so it can be used on a ka, haha. Though I would assume for the price that it would be better to go with a regular turbo or supercharger because they would end up being more cost effective over time, if not right off the bat.
That crap on ebay, will not work and will end up damaging something. Stay as far away from it as possible.