Its a real challenge to fit a brake controller into the limited underdash space. I was bashing my knee into my Prodigy when it was anywhere left of the steering column. Finally I squeezed it into the space to the right of the steering column. I had to bend the rectangular steel mounting bracket into an arched shape that roughly conformed to the bottom of the dash, about six inches below and forward of the keys. Now, it's found a permanent home, and it helps me keep my vacation home, a 16-foot Scamp travel trailer, safely behind me.
I have been looking for a place to mount my Prodigy. I think I have found a much better place, that is more out of the way. I mounted in the opening for the fuse cover. I know this isn't the prefect place, but it is great if you only need the controller now and then because I can easily remove it and put the fuse cover back.
I made two bars (I used scrap from work so excuse the look and the extra holes). The short one is 90 mm and I made two counter sunk holes 6 mm in from the ends. I also drilled two through holes that will attach the mounting bracket that came with the prodigy. The bracket has long slots the these hole positions don't really matter. The longer bar length is not so important (I made mine 100 mm), but the holes need to line up. All four holes in the long bar are threaded M4.
The two bars will sandwich two plastic tabs at the top of the opening. These are bolted with flat heads. The other two bolts go through the Prodigy bracket, the short bar and thread into the long bar.
This image shows the two tabs that I attach to. Note the square hole is an existing hole, and I drilled a second hole that lines up with my bars. You can't see it, but there are a couple of "wings" behind these two tabs, but there is space enough that the long bar slips in just fine.
This is the two bars attached. I can put the original cover back on, and no one would be the wiser.
And now with the Prodigy bracket...
Just screw the Prodigy in place and Viola! I still have to do the wiring, but the controller is in easy reach (for me at least) without really leaning over. When I am not using the Prodigy I just un-screw it, Un-plug it and un-bolt the prodigy bracket. I can leave the two bars and pop the fuse cover in. The only drawback is that the prodigy covers some of the fuses, although I shouldn't need to be in there much and it is easy to remove.
Just a side Note, the prodigy slip in holder was too wide for this opening. I would have had to cut into the plastic to get it to fit.