Any M.2 wifi card not requiring CNVio (i.e., NOT the AX211, but rather the AX210) will work.
As we can see the new technology of wi-fi 6. So is there any suggestion of wi-fi card model that we can replace to the current laptop model latitude 5490 to support the wi-fi 6 technology.
Searching for wifi card 6 supported model to replace the current laptop Dell 
Latitude 5490