Yeti,

I prefer a single vertical slice, and not too skimpy, maybe 3/8"...no longer use the "X" which leaves fragile little points that tear out. IME, the slice is invisible and much more durable, especially if I remember to use a large dollop of vaseline or light silicon grease on the screw as well as the driver.

I insert the screw tip from the underside to give me the location, then pierce it with a very sharp Xacto knife.