Test on an HP MediaSmart Server EX475. Works great!
Only "trick" is that you need to put the boot USB stick in the *BOTTOM* USB port for it to boot up. There isn't a VGA port, so you won't be able to see much, but it boots up nicely from USB stick, and allows installation through DS Assistant.
Great little box, with a lot more horsepower than a similar Synology box.