New system for new location, can I set it up with the APP without starting the monitoring (yet)?

I have been using Simplisafe at my house for almost a year.
I have just received a second new system with base station, keypads, sensors, etc,  for a new home (I am not moving the current system, just installing a new one at the new house).
I am not moving to the new house yet, so  I don't want to start the free month monitoring offered with subscription yet, I will probably do it in two or three weeks.
However  I would like to install and test the new systems and sensors. I have purchased many sensors, so for doing that I would like to use the APP (or the WEB page) since it is quicker and easier.
Can I add the new base station to my APP, without starting the monitoring system?
Unfortunately I do not recall if the monitoring starts as soon as you add the new base station to the APP, or if there is a second step involved with the process (and that I can do later).