Ask those who say yes if they have this model.
I think you may need to get the length of an SLX22 or SLX25 and go and measure up at a dealer. If you are a bit hesitant, take a length of 40mm basin or shower drain pipe cut to size. That vehicle appears to have a half height bulkhead protecting the back of the front seats so you won't be able to lie the pole down the center between the seats.
My son in law has a Transit Connect LWB with a full steel mesh bulkhead. The only way he can fit his SLX22 in is down the side at an angle with the brush head 'folded' back. he does have an aqua-daptor fitted but it doesn't add that much length.
With my son's Peugeot Partner van, I cut a piece of the bulkhead out so that he could run his SLX25 down the side of the van and into the passenger compartment between the passenger seat and the passenger door.
Always better to check and make 100% sure than buy the van only to find out afterwards that you have a problem.
Spruce