Adguard home is like pihole, but has built in encrypted DNS options. For easy mode NextDNS.

They pretty much all have the same block lists to choose from.

Chenbro makes quite a few ATX shallow rack mount cases. I have one and have no complaints.

I know you said you’re against rack mounting, but JUST in case:

I love the look and tidiness of a nice rack mount system. So I got a Chenbro 4U case. It’s perfect for reusing my old components, and it has a standard size area on the front to install a hot swap HDD cage.

I know android TV and Roku have jellyfin apps. But I would stay far away from LGs WebOS, and I haven’t heard of Tizen.

Id honestly buy w/e tv you think looks the best quality wise, then add a media player. For ease of use Nvidia shields are fantastic and run android TV, and work wonders with steam link.

What I did was a Sony OLED which has android TV and is fast enough to use streaming apps with little annoyance. And then I bought an odroid n2+ and installed coreELEC to use Kodi to stream media locally without needing to transcode. Then use jellyfin for if I want to stream outside the house.

Sadly my setup doesn’t have a solid Steam Link option, as the Sony TV isn’t powerful enough and there’s a delay in controller input and what you see on TV.

^ Hopefully some good ideas for you ^