I have an Asrock DESKMINI A300 with a Ryzen 5 3400g. I noticed that there is the newer Asrock DESKMINI X300 that supports Ryzen 4000 APUs and even looks better IMO. I
CES 2019: ASRock Launches DeskMini A300, World's First Ryzen APU-powered Mini STX PC | TechPowerUp
ASRock > DeskMini A300 Series
ASRock DESKMINI A300W AMD A300 Barebone System - Newegg.com