No real quick answer on this, the mountings depend on where the other mounting is and the stroke of your damper. I would firstly decide upon the wheel travel I can get/want and take it from there. Regarding mounting angle, virtually any angle is OK providing you aren't trying to bend the damper. Once you've found your bottom mount you need to locate the top taking into account the sweep of the arm through your chosen wheel travel. I know I've not given definitive answers but I hope it helps a bit.