I’ve been using dell P2415Qs. I run 3 at the HiDPI “looks like 2560x1440”. It’s not perfect 2x scaling, but it is close enough (185 dpi) and the price $300-400 each cant be beat. I’ve considered switching to the 21.5 inch LG ultrafines (220 dpi) but they are $700 and have very limited port choices compared to the dells. I use the dell displays with multiple other machines that don’t have USB-C graphics out. And want to be able to use the displays with eGPUs that won’t have USB-C out.
I just hope the default GPU of the mini can drive 3 UHD displays without choking on the dock animations :|