ZX Spectrum USB keyboards and mount the Raspberry Pi's behind the scenes. I had a look around for suitable wall mounting Raspberry Pi cases, but was surprised to see there weren't many around.
3D models on Thingiverse, Credit to the original designer these were very nice cases. The lid was a bit busy with cutouts for vents, camera, monitor, GPIO etc. so he respun the design to have a plain lid, then added the 'ts' tynemouth software logo to give a bit of ventilation (see his write up of using Fusion 360 for this). He then 3D printed the cases for me.