I have several knot Lil Cobber rear lights and one big cobber. Then I decided to get one front light.
The small ones all have one similar issue, it is hard to find the exact correct position to mount on. However the big cobber does not have this issue at all. The big one has more room and more clearance when mounting.
I lost 2 of my Lil Cobbers because I did not pay attention to the mounting. But if you mount it correctly, it will not fell for pavement.
But I kept purchasing them, because I like the 330 degree light. And it can fit my aero bike rear bar. And it is bright enough to do everything.