My, um, critique of this idea: there is no statement about the accuracy of the block. Maybe this information is somewhere, just wasn’t obvious to me on the Home Depot website or the WEN website. You’re looking for something that is ground to less than 0.0005 inch and preferably closer to 0.0002 inch or better.
If you’re into woodworking, then the Veritas set-up blocks with 1-2-3 block sold by Lee Valley are worth a look. Although, sadly, out of stock at the time of this post.