Pairing Home Sensor with Homebase 2

We have the Homebase 2 system with 2 cameras and are considering buying 2 Home Sensor door alarms.
Do they have to be paired to the Homebase?
When the alarm is triggered can the cameras be programmed to go off as well as the Homebase ?
If the alarm is triggered can it be turned off remotely through the app.

Many thanks R

“Do they have to be paired to the Homebase?”
Yes

“When the alarm is triggered can the cameras be programmed to go off as well as the Homebase?”
Yes

“If the alarm is triggered can it be turned off remotely through the app.“
Yes

Hope this helps!

Many thanks R