Ah the bulkhead might mean bikes don’t quite fit longways then. Though you get the van variant with a 0.5m extension behind the rear wheels which gives you the extra length you need – worth looking at that version?
Take a bike to the citroen garage, they were more than happy for me to have a go fitting mine in to see how it went, just make sure it’s clean.
Also if you can get it, the upward tailgate rather than barn doors is really handy, gives you shelter from the rain loading/unloading/changing.
Another blingo pro-tip, if it doesn’t come with the aux input (check the glovebox) as them to enable AUX1 in software (or AUX2 if you get bluetooth or handsfree) then its about £15 cable to get an mp3/phone input.
EDIT: also with the flat floor and not having the dip behind the front seats to drop the wheel into, some bikes you won’t be able to turn the bars as they’ll jam on the roof so they wouldn’t fit. Not a problem personally, but i’ve given lifts to folk where I’ve needed to wangle the bike in a bit till the wheel drops in the footwell.