We’ll add a couple marks that are one and a half inches in from each corner. The side you choose to add the marks will be on your dominate side. I’m right handed so I added a mark in the right hand, lower corner, and in the top left hand corner.
Next we’ll create a double hole that will partially hide the head of the bolt. You’ll need a forstner bit the size of your bolt head and I suggest a spade bit.
If you don’t have a forstner bit that large, use a hole saw.