I have expanded my setup over the years. And tbh, I reached so many stages where I read up how pi-hole or adguard achieved this and that. And every time it was like “damn,if you want more than the basics they are actually more complicated. I just have to look up this and this and Technitium does it by the book.”. That’s so refreshing.
Look at the Zimablade maybe. Full,Proxmox capabale x86, can be powered via PoE with a splitter(would not recommend it,though), cheap.