All except the S & X design ship with extension cables, as the factory cables in the door can sometime be a bit short on Model 3 & Y (no problem with the S & X).
Beware of lower-quality puddle lights; there's lots of cheap options out there, but we've put a lot of focus into ensuring the longevity of our bulbs and not compromising on any of the components.
Models S, Y and 3 have puddle lights in all four doors (4 in total, so two packs) and the X has two (so one pack), one in each of the front doors. Please be aware that the mounting position on the front doors of Model 3 & Y are set at an angle, so this will slightly skew the projected image. Model 3 & Y also have a limited current available, so if both doors are open on the same side of the car at the same time, you might experience a dimming of the projected image.