Dishwasher feet stand-off

Made these to stand the Dishwasher on.
Our Fitted dishwasher within the fitted units has it's feet adjustment screws turned out to nearly their maximum to make it fit so a little unstable.
This raises the feet of the machine up by 40mm, with a total height of 45mm
A 5mm deep recess which is 29mm square keeps the feet within the top face. It comfortably fits in the 25mm hexagonal feet of our dishwasher. To increase strength of the structure I've made a cutout through the middle that me