Grid racks are horrible! Whatever you do, don't go with grid racks! They are easily disassembled or even hauled away with the bikes still locked to it! They only allow for the front wheel to be locked so you can kiss the frame and back wheel of your bike "bye-bye"! Grid racks need to be done away. Period.

Go with the inverted "U" racks or Wave racks properly spaced and placed near entrances of buildings.