I will be doing this on the cnc not laser. I need about 300 4 x 6 ThanksWalk into your local trophy/engraving shop and ask them to make some up for you. I do this kind of work basically every day.
Just to be clear, that definitely looks rotary/mechanically engraved. It is not laser engraved. The only reason I bring this up is on rotary plastic, the top cap is thicker than on laser friendly plastic. It will likely make it more durable.
You know, I thought that, too- but I'd think that would have a sharp edge to the cleaned out parts, even as thin as the face of most ACM is, that might cut someone stepping on them, which I why I suggested an engraving material like Rowmark.1/8" thick.. black core white face. looks like 3mm dibond to me.