For 10-20Watts you can use a slightly dated office-desktop (thin-client) that will take a pcie nic and usually has more than enough processing power. A step fu

For 10-20Watts you can use a slightly dated office-desktop (thin-client) that will take a pcie nic and usually has more than enough processing power. A step further would be a laptop that can come by with 5-10W and still run circles around typical arm-based off the shelf routers. thou the second nic will probably connect via usb3, you get a real keyboard and screen for troubleshooting.