Unless you want to look at multiple CCTV screens at the same time, there’s no real reason to make multiple captures.
For something like this, one wold need to capture it 16 times, though:
But then I’d probably pack it into a single material somehow.
But if I ever see only a single camera feed at one time, I’d just shift the capture component to the new location.
So if the player enters a new floor of the building, place the same capture on that floor.