2-board bench press: how thick should the board/block be?

Thanks for all your great templates! Currently running LSF and have a question about how to set up the 2-board bench press.

I’m using a Rogue block with multiple options built into it. How thick should the block be to count as a 2-board?

image attached for reference. I think I have it set up as you intend but want to confirm.

That is fine.