CVLIFE Foam Pistol Rack for Gun Safe Shelf Pistol Holder Gun Safe Cabinet Accessories Handgun Rack Pistol Stand for Storage

There isn't a whole lot of gun safes in odd form factors, but I'll get you in on a secret: it doesn't need to be a "gun" safe. Look for normal office / home safes for documents and valuables. SentrySafe has some half-decent ones (e.g., SF123ES), so do many other manufacturers. You can then buy a handgun rack separately, here's an example.