I don't have any pics, but my N20 is mounted on the plenum and the Fuel is mounted on the alternator. Its not the greatest setup and I plan on moving them but thats where they are right now.
This is the NOS Direct Port System - I crafted the bracket for the solenoids. I bought this setup used and the bracket that came with it seemed to be for a different year or something. So I welded two pieces of scrap steel together at a 90* angle and drilled the appropriate holes. It mounts on the alternator mount.
Also of note in the pics is the NOS window switch (easiest way to mount that was with zip ties!). And the FP sending unit right next to it. Also see the mess of miss matched pieces that make up the connection to the schrader valve. I never had the chance to swap these out for cleaner matching pieces - car was totaled just a few weeks later.
I'm a big fan of making the nitrous system well hidden. I put the solenoids inside the passanger inner fender, and then run underneath into the air tube. I hide my WOT switch in the gas pedal, and run plain black tubing from the fuel rail to the solenoid. Then, anything in view gets covered in the black plastic sprial wrap. It takes a sharp eye to find the nitrous after I install.
It's fun that way. It makes tech much easier at the track, and keeps people wondering.