@loremipsum
You may already know, but Snikket uses Prosody under the hood. It's like an opinionated config with a few other things already bundled like coturn and cert renewal. People do "hack" their Snikket server but it's usually recommended to run Prosody directly if you want more customization, and it's totally possible to migrate from Snikket to Prosody.
Also about stun/turn I often hear eturnal is nicer to setup than coturn. Both will work fine