Having recently obtained a couple of MT RB4011iGS+RM's for install in a rack.
I have to say what a poor rack ear attachment design for this router.
The router is a nice robust bit of kit, but the rack ear attachment is terrible. Just 1 small screw on either ear to hold this unit is place is just crap.
Please Mikrotik at least put a second hole in the 4011 at the TOP / SIDES etc to SECURE the device properly.