You can place them on your laptop and use mobile broadband without needing a USB dongle.
You can place them on your laptop and use mobile broadband without needing a USB dongle.
You can't run a WWAN card over a SATA bus. So no, this won't work. The adapter you linked uses sata power, but there is no data connection you can use anywhere. You need to use a mini PCIe slot here, that's already on the board. If it's not, then you're kinda SOL.
The M.2 port for SSDs has a unique keying system. Devices such as WiFi cards employ the E-key, whereas SSDs require B and M keys. These configurations don't match, so they won't work together.