I had a similar thought about the IKEA KIVIK sofa (non-sleeper variants), which has wide boxy armrests that are open to the underside, and could fit towers of l

I had a similar thought about the IKEA KIVIK sofa (non-sleeper variants), which has wide boxy armrests that are open to the underside, and could fit towers of little SFF PCs, or maybe rackmount gear sideways. There's also space underneath the seat, where rackmount gear could fit. One of the reasons I didn't do this was I didn't want a fire with sofa fuel right above/around it. I wasn't concerned about the servers, but a bit about the UPS. Sheet metal lining of the area, with good venting if the UPS battery type could leak gases, I'd feel a bit better about, but too much work. So the gear ended up away from upholstery, in rack/shelving, where I could keep an eye on it.