This is just using old laptops as servers with extra steps.

Let me present my self-hosting strategy:

1. Buy old laptops for less than €100 a piece, especially if they have good hardware and cracks in the frame, dirty keyboards, etc.
2. Put them in a cabinet with power and an old 1Gb ethernet switch
3. Install whatever you want on them (in my case a Talos Kubernetes cluster)

Much simpler, and a lot cheaper