Hello!
I regularly use the Kensington SD1500 USB-C Mobile Dock. (60€ on Amazon, cheaper on eBay)
It works well for both FP4 and FP5, and for both “mirror mode” and “desktop mode”.
No extra software needed, just plug and that’s all 
The only drawback is that there is only one USB-A port, so I have to choose between wired mouse or wired keyboard… 
/ 