I have been planning to redo the garage apron for 2 summers now. The project is a bit daunting so I have been putting it off. In the interest of getting something started on it, and to send enough last year at Home Depot to get a reward, I put gutters up over my garage stall. Not too hard a task, but I did need some help holding them up there while I attached them to the facia.
I think to note, you need to seal the pre-fabed corner pieces otherwise they leak.
I made the little jog in the downspout, because that was as far as I could get with the length of gutter I purchased after cutting for the corner. I could see regretting that if ice builds up in there. Also, I put it up a week ago, it rained once and there were a bunch of leaves in it already. Hence I added the gutter guard stuff.