How Did You Mount Your Tunze 9004 in the JBJ 45 RL Aquarium?

About 2 weeks ago I purchased a JBJ 45 RL Rimless Aquarium with a Tunze 9004 Protein Skimmer to place in on of the rear chambers. I originally wanted to place it in the larger overflow chambers (first chamber on the left and right side of the aquarium). Unfortunately their is a wall with a small gap that will not allow the magnet to get a proper grip so the slightest touch causes the protein skimmer to slide further down into the chamber. I now have it placed in the 2nd chamber with its orientation matching the aquarium back to front but their very little space for the water to flow into the unit from the front grating. I had two major questions.

1. Are the external magnets waterproof? My external magnets dont look black with the tunze light blue color and appear to be sealed. This would all me to move it back into the first chamber and place the magnets in water and allow more flow into the unit.
2. How are you mountain it. It week two and my collection cups fills daily with just greyish water with obvious signs of pieces of skimmate.

I know this is hard to imagine with photographs. I will post some up later but any assistance would be appreciated.