Not only do cats love to perch in high places, but they love a nest-like concavity. The top of a suitcase, zippered shut, attracts them as it sinks under their weight to become concave.
Small computer printers also have a nice cat-sized concavity for the pages spitted out. It is even a little warm, an added incentive. Alas, cat hairs are left behind and some may gum up the works.
Here is one solution: a wire-mesh desk tray, turned upside down and stuck in place by those three adhesive black wire guides intended to hold cables in place.
That’s one fine looking seal point there. I presume Dot and Dash are sisters?