Tin snips and a metric size tap and die. Youre right that a lot of cases have proprietary or non standard power supply mounts. The only guarantee that I could fit anything, including motherboards, in some cases was to get a template and do it myself.

Sorry, you wouldnt and didnt mean to imply that. I was suggesting that port forwarding is a fairly easy task and if one is confident in their ability to do that, than they should be able to complete a PiHole install.

PiHole runs great on older Raspberry Pi’s(I am still using a pi3). Older models are still very easy to get and a readily available from the approved resellers list.

I felt the same way about youtube, streaming, shopping and general browsing: too many ads. Ruins the content. I set up a pi-hole as an experiment to see if it would do what it said and what others said about it. Manage your expectations here. Pi-hole works well for blocking a lot of static information and ads in your browser and a lot of apps on iOS and Android. It does not block video ads on Youtube or Hulu, it does not block ads for Roku or Firestick or Smart TV apps for example, it just does not work because of the technical limitations of how the PiHole software is designed. Using a regular PC with adblock browser extension installed as well gets rid of 99% of ads including video ads from adcdns. PiHole is incredibly easy to setup and install, the pay off in quality of life is enormous. I cannot recommend it more to someone that has a little networking knowledge base. If you can figure out how to port forward and run a handful of command lines you can complete a pihole setup in an hour.

Newer systems are way more power efficient than those of yester-year. Systems design and engineering, while built on the principles of the past, have very much changed just in the last decade alone. Older mainframe systems are really no better than museum pieces and technological curiosities today.