Even on a street bike, you would need to mount the lights far enough in so that weak thin walled BMW crash bars that are prone to deflect inwards will leave the mounts untouched. Think of a roadside stop tip over.
If he plans to ride it offroad, then even with crash bars, he could easily lose his investment with a nice front end washout.
Ideally you want to mount them tight into the bike and low enough that a street or dirt slide/highside will let the crash bars do their job.
Note the crash bars on the F650GS below and how effective they were on a gravel road...
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