I'm happy with XigmaNAS (BSD) on a used mini-pc and a multiple USB3.1 HDD enclosure. Speed is excellent as is stability. Having some memory and CPU cycles to spare, I also am playing with Home Assistant Supervised run as a Virtualbox VM inside of it.

Regarding that LaFrite board, I mailed a while ago LoverPi, which appears to be the only one selling it, to ask them if they accept PayPal, but got no reply. Does anyone know of a distributor in the EU or a different worldwide seller?