Hi Diluxe,
The SB has a cavernous boot wrapped in a svelte rear quarter. But those thick C pillars and styled rear window means that vision out the back is extremely limited, so yes parking sensors and rear camera are a necessity.
Have also found the lane changing / side mirror assist very useful for the nearside.
I've had mine two years and clocked up 30k miles with no manoeuverability issues, been an absolute pleasure to drive.