I fitted one of these to an X-trail:
http://www.ebay.com.au/it...m25791193f2&_uhb=1 It replaces one of the license plate lights, you could probably make it work above the mr2 license plate, very unobtrusive and looks factory.
I hard wired mine in, the wireless is prone to interference.
You could fit a couple of LEDs for illumination, they are mega bright these days. The xtrail has two normal reverse lights mounted low in the bumper and they illuminate the reverse view fine in total darkness.
Reverse cameras are VERY handy!
Are you guys using stereo display units or reverse mirror ones?
Cheers