Look for the Cisco Meraki MA-MNT-CLG-1     T-rail mount kit, 1st using the mounting plate for the AP mark the t-rail with a marker using two holes on the plate,  then you twist this against the t-rails after loosing the allen screws with the middle hole lining up with the marks made, then tighten them down and attached to the mounting plate for the AP with the supplied screws. Use them all the time, so far have not seen any manufacture do this as well, simple, secure and fast.    Tomasz  ... View more