Since the light is round, you might try making a custom mount from a pair of reflector mounting bands or whatnot. Here's my 140 taillight hard-mounted with a pair of old computer-mounting bands:



That said... I really don't think you need to worry about biasing the aim of a floody-beamed 200-lumen headlight, not when it's aimed at a person behind a tinted windshield with 2000 lumens of their own to see by. Besides, if the road curves in the direction you biased it...? Yeah.

I guess there's places where the roads are all straight and the terrain is all flat, but in my area, it would be futile to try to correct headlight aim like that. That's one of the nice things about the DiNotte 600L, however... you can swing it to aim sideways about 30° in either direction, effortlessly, if you want to avoid blinding someone. I sometimes do that if I encounter a pedestrian on the side of the road in the dark (if I see them in time, anyway).

I do sometimes dim my 600L for oncoming traffic in no-light situations on country highways, but it's more of a negotiating measure to get them to dim their high beams on their car or motorcycle.