Just picked up a Hyundai coupe space saver spare wheel for my NC1. Really good condition hub with an unused tyre for £30. It fits in the boot with space to spare.
I’ve seen posts that say you shouldn’t fit them to the rear of the car to protect the diff which makes sense but I’ve also seen a post that says you should ONLY fit them to the rear! Which is correct?
Mike
It even came with a tray that fits inside. 
The bigger issue is that the wheel you take off wont fit in the boot. Fingers crossed you have no passenger that day.
Normally you wouldn’t want it on the axle with the diff, so my gut would say run it on the front. If you are close to home, then I wouldn’t worry.
I carry bungee straps so the flat wheel can go in at an angle and rest on the boot lip and the boot can be strapped down.
If nothing else it will be useful to put on the car while parked letting me get any tyre issues sorted rather than leave it on axle stands.
