I slant my overlay at an angle that puts if about halfway through the end of the stave toward the belly. I eliminate the bump on a log look that one get by putting an overlay on top of the back of the limb.
The only one I had fail was when I had a string slip off to one side of the nock when I was stringing it. The string split the overlay and part of the limb back.
I fixed the break with a very long overlay, thousands of arrows later the fixed bow is still shooting.