I can't find the beginning post, but I finally hung mine pretty much in the same location only I drilled into the side and went all the way through... didn't hit anything if that was the issue.. but screws were too long to go into the bottom... not sure why that is, not like there's going to be a hurricane... but you do need to predrill it.. or I did anyway..
Probably didn't help, but?? hehheh, just in case..