Just measured the hole depth of a spare piece of linear rail I have laying on my desk. The holes have a a chamfer so if you used some taper headed fasteners it’d probably buy you an extra mm of length, but if you’re using flat headed m3 bolts, the depth for the rail is about 5mm. So 5mm (rail) + 6mm plate would give you 9mm. My nyloc M3 nuts and washers stack up to 6mm.
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