Raspberry pi 2b is a lot easier to get my hands on than the exact backpack i wanted. Also it will apparently do perfectly fine running only pi hole. Its only 21 bucks. Plus shipping. So 25. And then I need an SD card. 8 bucks. But I'll get double that. 16 bucks. And the 2b has enough usbports to simply plug in a mouse and keyboard and monitor. Which I don't think I even need to do because I can set it up so I can access it from my computer. Simply plug it into ethernet. Haven't checked if there's space. Don't have a short ethernet cable. Pop by a local shop.