Most of the fan grills i could find had the grill too close to the fan blades which increased noise, had holes that were too big or just too flashy, so i had to make my own.
A couple of hexagons later and here we are...
The shroud extends 10mm from the face of the fan. This thing is made to be a snug fit for a 5.5-6mm diameter hole even with a screw in it*
One stl has a chamfered face (chmf), the other one doesn't. I would use the chamfered one if I were you.
*your mileage may vary, a crappy SW_2018 part included if you want to modify it.