I would just go with a 2012 Mac mini, they can be upgraded to 16 gb of RAM and have 2 slots for SATA SSDs. On my work we’ve just used one to install a complete K8s cluster on it for demo purposes. People are amazed of the power from such as small form factor, quiet too!
Of course, the revenge driven justice system is not looking for the most humane way to kill someone. The cruelty is the point.