If you use the Rollz Motion as a rollator walker only, you can leave the wheelchair package at home. If you want to have both options available all the time, then you can bring along the wheelchair package and keep it collapsed behind the rollator walker.
It is also possible to hang the wheelchair package above the seat, for more walk-in space. For that you will need a hanging system called the 3-in-1 wheelchair package holder, this is an accessory that already comes with the Rollz Motion. See here how the accessory works.