AsRock Deskmeet X300, probably the most boring but simple SFF? : r/sffpc
ASRock DESKMEET X300 Mini PC Barebone System AMD X300 DisplayPort, HDMI & D-Sub Supports a discrete Dual slot Graphics card up to 20CM(card not included) 8 Liter compact size - Newegg.ca
Asrock Desk Meet X300 First Look, An Awesome Super Tiny DIY Gaming PC - YouTube