Yes, it works kind of like the rotary tool on the laser? We also have a vise (I think) that can hold the object to prevent it from rolling around but sometimes you don’t need it if your pen adheres to the sticky surface bed thingy. I’ll put up a metaza pen class soon which will illustrate how to use it for non-flats.
For your project, since it looks like its colored aluminum, you would need some sample pens to test out the depth settings on the metaza/laser before doing the final, because thickness of the layer can vary, so testing is required to see if you get the finish you want. We can also adjust the impact levels on the metaza to engrave deeper.
You can actually do either way if your design is that small, doing it flat on a laser bed should work just fine, you shouldn’t need a rotary. Doing it on the metaza would work as well.
It’s totally up to you and I can help you with either if you want.