Imho it shouldn't matter much, top OR bottom. Or difference in mounting strength of any to be too different with other bolt being stock, whichever one of bolts is replaced with camberbolt. If you hit something hard enough to break/shear any camberbolt+other stock bolt combo, imho there are other things to care about with THAT hard of hit to suspension, like bent control arms, topmounts, damaged wheels and such.
Meanwhile -1 to -1.5 seems to me as a bit too conservative, but as wished (by me) -2.# needs both camberbolts anyway (OR anything from slotting/lowering/camberplates), i don't have to choose
