A while ago, I got a Radxa Rock board as a make-do mini server. And I'm really happy with it, so happy in fact, I got a second one. Now I have Apollo and Artemis, running together in harmony. The guides over at the wiki is very straightforward and it's easy to get going. One thing to note though, that really freaked me out, is that the ubuntu server image, does not have a command line, meaning, you cannot hook it up to a monitor. It will look like it hanged, showing only 4 tux penguins in the corner. You must connect through ssh and configure your server that way. Quite troublesome if you plan on using it over wifi-only like me. But once done, it's a very nice machine to work with.