I'm sitting here, looking at the cookie cooling rack that my laptop sits on (too keep it cool

) and I started thinking there must be a possibility for using something like this to create a level in the rat cage. It's sturdy black metal, guessing powder-coated. This one looks to be about 11 x 18 and the spacing looks about 3/8-inch by 3/8 inch. Is that spacing too narrow? The challenge becomes how to attach it in the cage to test out the theory. The cage is 20.5 inches front to back, the rack is just under 18. But I'd probably buy a different rack for this -- the laptop is sitting on a pampered chef cooling rack and I know there are less expensive ones out there.
Any thoughts?
Andrea