Two baby monitors?

Hi ladies, I’m prepping a bit early, but all these questions are floating around in my head lol

I just got a HUGE strong positive last week and my son will be one year old on November 12. That being said, my children will be approximately 20 months apart. They will each have their own rooms. I have a video monitor in my sons room right now, that has 2 cameras I can use with it.

So my question is, should I just put one camera in each room, and set the video monitor to scan between the two rooms, or buy a completely separate monitor system for the new baby and have 2 video screens? The newborn will only be in their room for naps, as we will cosleep at night for the first 6 months.