Your local pet store should have something to EXTEND a
power head pump.. well who says it needs to be a power head ?
For example.. the power head kits usually come with SLIDE ON BACK type mount.. or over hang mount...
Well there are other ways to do that too...
A long piece of thick plastic with two holes drilled for your suction cups..
the plastic can extened from the glass leaving you with enough room..
I ended up clamping two together on a hagen heater I had before it broke...
the heaters are quite bulk but with a little effort you can get that mounted..
let me know if you need any further help . here is brief example of what I mean..
__________ <--Glass
o | o <-----suction cups
| <--- plastic arm from pet store
|
| H | <-- clamp
H
H
I know its vague but can be done.. I will get links for pieces for you.. I will post in a moment..
Hard to explain this ehehe Wish I still had my setup I would mail it to you..