The Fly-M2WE is for use with Fly-Gemini boards and the Fly-Pi. it can be purchased from AliExpress here https://s.click.aliexpress.com/e/_DC2tjtP
This link is affiliated URL. If you purchase via link above it will give tiny cent of commission to the community organizers. (We are not Mellow employees, just 3D printer enthusiasts) This will not hurt your wallet and at the same time help us to maintain the GitHub better.
For Klipper support please join this Discord Channel https://discord.gg/zAung88zbK