The PC Engines site says ALIX is EOL, and recommends using apu2 instead. Is there a particular reason you would recommend ALIX over apu2?
Couple it with 2x wle600vx wifi radio for dual band wifi and openwrt or another Linux based router is. No 5ghz driver on *bsd.
The alix is the predecessor and is EOL.
Unfortunately, the apu2 is out of stock from pc-engine main shop due to chip shortage.
You might be lucky and find a reseller with some stocks.