This device here can't do what you want.
What you are looking for is a router with 5G (
https://www.digitec.ch/en...). However, you must have an additional SIM card. With most mobile phone subscriptions, you can buy an additional SIM card per month for a few francs.
However, before I would spend 200 francs on such a router, I would first make absolutely sure that the Internet problem at home is not a problem with your setup (WLAN router position, etc.), but really the Swisscom connection. Since the latency with the 5G will probably be worse than with the house connection, which is not so good for online games via the Playstation, for example.
The cloud gateway where you asked the question here is just a hub if you have other Ubiquiti devices to update and control them together.