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When I setup my 54 gallon corner I learned a lot of the lessons you have. Trying to squeeze 10 lbs of stuff into a 5 lb. bag make you get creative. Wire and hose management becomes paramount. I hung reactors from the top frame and my controller to the door. Good luck with the build, I'll be...
Not owning one I am merely speculating but if you had the power head near the surface the "blocked off" portion would prevent you from creating a Sort of venturi on the surface. I guess it would do the same if it was placed closed to the bottom.
I agree with RWC, a water detector on the floor, a float switch(s) strategically placed to sound an alarm and shut a valve or pump off, I'm surprised if this wasn't part of the system.:eek: