I've got an adjustable stem bolt mounted one from Amazon that I'm not using, has a GoPro attachment underneath as well. One of these: https://www.amazon.co.uk/dp/B07YTJHYM6/ref=cm_sw_r_cp_apa_i_sbBIFbT48SXPM
Does it cope well with offroad vibrations/abuse?
I'm not sure, I've never actually used it. But I can't see how it would be a problem, I've never had my stem bolts rattle loose off road. Bit of Loctite on the bolt threads and I'm sure it'd be fine.
@giofox started
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I've got an adjustable stem bolt mounted one from Amazon that I'm not using, has a GoPro attachment underneath as well. One of these:
https://www.amazon.co.uk/dp/B07YTJHYM6/ref=cm_sw_r_cp_apa_i_sbBIFbT48SXPM