2 kg powder extinguisher – where to attach

Hello guys, as it says in the title, I have to attach a 2kg powder extinguisher somewhere in the XC90, safe and yet relatively easily accessible. No, please no discussions, for which I need this, I don’t want to screw up my car with it, no fear. So please only serious advice, like own experiences etc. My idea would be, in the back area of the trunk, where left and right these “bookings” are located. The nozzles would remain almost completely free, but I have no idea. no idea if and if so how to attach the holder there. Or does someone have a completely different idea? Greetings Itaker