We've developed a Bengle-specific version of our IKEA Coffee Cart.

There are two holes for the four feet:

with the normal feet that come with Bengle, the espresso machine sits slightly countersunk (about 5mm) into the top, so that it doesn't move.

you can remove the feet and replace them with a bolt we supply, and lock your espresso machine to the cart. This ensures that when you're pushing the cart down the street, it can't fall off the top.

you can still adjust the height of any foot, to compensate (for example) for a non-level floor.

There's also a cable routing hole in the back.

and you can see how low profile this is, so that the espresso machine almost seems to connect to the wood itself.