So what I'd do, id try and attach the overflow hoses to the can somehow. Zipties, c clamp, something just to make sure it's going to stay in the can and not cause some freak accident. My luck I'd come home to a giant puddle and a bunch of dead fish and whatnot... return line and nozzle, the nozzle has that suction cup but not too sure how well that'll work. But I think the hook on it would be ok enough to keep it where it needs to be. I would try and not have any part of the return line touch anything as its going to vibrate a little and cause some percussion that I doubt you'd like to hear. Definitely try and use some plastic ratchet clamps on all barbed fittings. Some sort of valve (ball valve works but gate valves work better) so you can either control your overflow or your return so you can get a quieter overflow. Otherwise you have a good chance that thing is going to sound like a toilet flushing.
