What is the best way to mount the 6 in. Galvanized Steel Foundation Vent to a stucco exterior?

Here is some information about mounting.

FV146G & FV146B are designed for new or repaired stucco construction, installed prior to the stucco.They are nailed or screwed at the flanges to studs 16” on center.The “reveal” allows for the application of the housewrap/felt paper, then metal lath or netting, then the scratch & brown and finish stucco coats. When finished, the stucco surface is flush with the vent (louvered) surface.