I'm building a box based on the AsRock DeskMini X300, which has an empty M.2 E-key slot for a WLAN module.
Alternatively, I might use a WLAN USB stick. Price is rather unimportant. I'm more interested in support for FreeBSD (13 and up) out-of-the-box, i.e. I load a kernel module, frob a file or...