Adding the $1000 Bricasti network card to your M1 would be far better, and less expensive, than the Lumin U1 Mini or a Node. IMO.
I own a Bricasti M3 with network card, and I have owned a Lumin U1 Mini with SBooster power supply.
I own a Bricasti M3 with network card, and I have owned a Lumin U1 Mini with SBooster power supply.