When I had my tow hamsters I used this folding table
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1
And put the Alexander (which is pretty close to the barney) and had the zoo one 2 underneath it. Pretty sure the Alaska would fit underneath.
The link says this table is no longer available but it’s just to give you an idea. There’s loads more similar tables on amazon that would work.
Though a plastic table can be a bit of an eye sore so if you want something more permanent, I think Ikea might have something. Worth a look anyway.