Any glinet routers will do the trick. They have overall good routers in a wide range of prices. Note that all of them have openwrt installed by default.

You can use Parsec. It’s free and closed source, but it has an optional driver that, if you install it (you will be asked during the main installation) it will allow you to use Windows in remote without an attached screen. I tried it and it worked quite well. In the remote device you can even select at what resolution you want your host computer to cast when there is no screen plugged in…