init7.net. They have a bunch of official guides, but also help with other devices and have debugged issues with new devices. Basically if your device is capable they want to make it work.

Init7 is great, I only had to tick a checkbox saying something like "I know what I am doing" and apart from providing the technical information they left me alone. Only had one problem with them that they resolved very quickly (the fiber cable got damaged somewhere in the basement).

+1 to init7. They've gone above and beyond when I needed them to change their routing policies to improve end to end latency to a specific destination. Good luck getting that from a major us carrier. And I wasn't even a customer.