bumper alignment

[WS6]

I know this sounds silly but I'm really not sure how to align the front bumper on my car. Sure I could just try to put it back on with the bolts in the same location but I'm curious to know what's the proper method. After all, my bumper is covered by the urethane front end which prevents adjustment after the fact. So are there any alignment/reference holes or measurements? I didn't notice any alignment holes like with the fenders and subframe.

Thanks