1 camera or 2 help

Hi I am looking to get a couple of cameras to start off and I am stuck at the first hurdle 1 camera or 2 for the same view but a longer range. So I live in an upstairs flat and only have 1 door at the side of the building, this door is up 6 steps from ground level and in the centre of the wall which is 7m long, I have a path running up the side of the building just under 2m wide. At the front of the house I park my car which is <2m wide and I would need to cover 6m in length.
So do I try for...

1 camera or 2 help