On my trike, I mounted lights behind the hole in the tupperware just behind where my co-rider's legs ride. There is a small hole there that allows the light to be seen, but not the LEDs themselves. I put aluminum tape on some plastic so that more light will reflect out. I prefer to see the light, but not the source. Another good spot is behind the shark grills. Anyplace that you can securly attach the Lizard Light, run power to the power source and the light is readily visible is good.
I've also seen thjem mounted in speaker enclosures.