How wide is it inside your overflow in the middle?
The inside overflow in the middle is about 5/6" front to back, the actual piece of overflow is around 4" wide.
Right in the middle is how I have mine and it's awesome positioned like that
Awesome! Have a pic?
Are you mounting it horizontally or vertically?
If I mount it directly on the overflow or to the left / right of the overflow it'd be vertically. If I mount it on the opposite end of the tank it'd be horizontal.