Movistar Espana - Askey RFT3505 device tracker

So I’ve just moved to Spain, and subscribed to Movistar.
Got the Askey RFT3505 router, and wanted to use device_tracker to track us if we’re at home, and use automations according to it, but couldn’t find any integration for it.

The only custom intagration found was this one:

But it doesn’t work for me, saying the integration is not found.

But it is there.

Any advice, or other integrations probably?
Thanks guys!