Beelink EQR6 has an internal PSU and is also quite small, a bit smaller in footprint actually. It even comes with two full-size m.2 slots and expandable RAM. M

Beelink EQR6 has an internal PSU and is also quite small, a bit smaller in footprint actually. It even comes with two full-size m.2 slots and expandable RAM. Mini is great, exceptionally so, I actually just got a rather souped-up one (that's the reason I'm in this thread) but x86 vendors are catching up and there's a certain possibility that more established brands will pick up.