There’s currently a huge rise in popularity for DIY CCTV kits - these usually come with a number of cameras and a monitor.  The beauty of these kits is that they can come in a wireless form - so you’re not routing wires everywhere.  Instead the set up is relatively easy, allowing you the freedom to put cameras anywhere you please. Such cameras can be tucked away in the garden, perhaps with one obvious one on a wall somwhere to act as a deterrant as well as an extra eye.  It’s up to you how you place your CCTV cameras around your home.