Yes, there are 4 holes in each corner of the board. I guess I'm just being lazy, and don't want to drill and tap the holes for the standoffs

Although nylon standoffs really would work pretty well. And not that much more work for all 10 boxes I'll probably sell.

I can leave room around the board so you can drill two holes through the bottom of the box to mount it to the car.

I'll print out a label and have it on the inside of the box showing which wires go where, and how to set the dip switch.