Here's 4 pics on my personal Raptor. The nitrous bottles are mounted to the nerf bars. Because of my 6" swingarm, I was able to mount them here and so far, it's worked very well.
The second and third are my auxiliary fuel bottle. I mounted to the backside of the overflow bottle. I use a small hand pump to fill it and it's not as bad as it would seem tucked up under there. I like it there as it's somewhat hidden and it takes the vibration of the dunes well. My fuel bottle has the optional fuel level gauge installed.
The 4th pic is of my smart box. I don't have an airbox in mine, so I mounted it to the back of where the airbox went. When I had my airbox, I simply mounted it inside on the back behind the air filter. It worked well there. I did build a small clamp/bracket to make sure my box never fell off. This is not part of the system...