Actually, there are "several" homes! The home switches will give the Machine Origin coordinates (G53) and as you have shown, is one of the common locations. Next, you will want an offset to your working part (usually G54). For instance, on my machine G53 home is as you show and I have a permanently mounted fixture for doing PCB work. It was made and the offsets for G54 (top side of the PCB) and G55 (bottom side) have been saved to a file.
Now when doing a setup, it is a simple matter to home the machine, load the offset file and your ready to go.
But having said this, you can set it up to suit your own personal preferences. If the factory has it in one place, you can make you own offsets and away you go.