for me, keeping it simple is a big part of doing this. The boards are sitting on the ground, anchored in place with rebar and clamps.
snakes seem to like to lay right at the bottom edge of the boards. We killed a copperhead in there a couple months ago, and last year, killed three snakes. I'm sure they are hunting mice, which probably enjoy eating the veggies. This year we are laying red cedar mulch in the walkways. It's expensive, and time consuming, but where it's been done, there are no weed, you can walk there right after watering, and we're hoping that snakes will be more obvious.