Mine attach on the bottom of the hinge and mount to the side of the "footbox".
Maybe I'm a idiot when it comes to strut geometry, but i found it critical to get it jsut right ... and because I can never do that on my first attempt, what I did was bolt a 1/4'' plate to the footbox, then drill/tap the plate for the ball stud. Then I just kept drilling/tapping holes into the plate until I got the perfect position for the strut.