Good to pay attention to, I first installed mine with the bottom bolt below the gas line and, predictably, incurred the infamous curved back plate. Learned on this forum the problems with the curve, so corrected it.
Removed the Equal-i-zer hanger, removed two propane line clips, gently bent the propane line down for the hanger bolt. Reinstalled the hanger with the bolts snugly against the frame, top and bottom. Tightened down well and now no perceptible curvature on the back plate of the hanger.
Installed four years ago and have never had any slip or movement of the bracket, even when the back plate was curved. You can see pictures of the bracket over and below the gas pipe on my photo album on this forum or at our web photo album, Picasa Web Albums - dreamstreamr