When this adapter is in addition to four screws, four large enough plastic washers with a recess for the screw head so that afterwards in the pocket not tall. Only the assembly was a bit fiddly, because I only awkward a drilling template for the adapter had to tinker. This was not going well on the Racktime website I have searched in vain.
So the crafting of the template took longer than the actual installation, so a star deduction.