It would probably work although I don't see the need for the powerhead if you are intending to use it for a surface skimmer for a HOB
protien skimmer. You'd defeat the purpose of having the surface skimmer by running the PH
on it IMO
. I wonder if one of the Aqua C surface skimmer boxes would work for you? They are already set up for a skimmer and are intended for use with a MJ1200 or, the larger model, with a Mag 3.
If you were intending to use it as an internal overflow skimmer, I wouldn't trust the suction cups to keep it attached. I'd probably add some kind of bracket or drill it for a nylon bolt just to be safe.