I put my spare right behind the rh seat, and slide the seat back, so it stays wedged in there. It doesn't move or make any noises. I also have a tiny jack from a scrapped Zuzuki, which fits fine under the rh seat, and a deep socket/breaker bar set, for the lug bolts, that I keep in the rear compartment, with my safety triangle.
I drive over 3000 miles/4800km per month and it does give me a little piece of mind to have these onboard.
Regards,
Serge T