I have 3 x10 (ninja) pan and tilt bases and only 1 x10 camera. I also have two other wireless cameras, but the way the x10's are set up, only x10 cameras are compatible (as far as I have researched), so I made my own modification to fit my wireless camera on it. This enables me to turn the camera on and off with the base, so it won't interfere with my other one.
If you aren't familiar with what a x10 is, here's a link: http://www.x10.com/homepage.htm
Warning: There is a chance of electrical shock while doing this instructable. Make sure the base is unplugged while working on it.