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
ASRock > DeskMini A300 Series
Asrock Deskmini A300 Review and Install - YouTube
ASRock DeskMini A300 - AMD Ryzen & AM4 CPUs In Small Form Factor
ASRock > DeskMini A300 Series
ASRock DeskMini X300 and A300 mini PC barebones first to support up to an AMD Ryzen 7 Pro 4750G APU - NotebookCheck.net News
Amazon.com: UpBright 19VDC AC Adapter Compatible with ASRock DeskMini 110 110W A300W A300/B/BB/BOX/JP X300 X300W 310 310W H470/B/BB/BOX/JP H470W Desk Mini Desktop Ryzen 120W 19V Power Supply Cord Cable Charger : Electronics
Closing Thoughts - The ASRock DeskMini A300 Review: An Affordable DIY AMD Ryzen mini-PC