If its a 5 door, double check the weather seal behind the door card these have to be stuck on perfectly and be completely watertight or they will leak. The design of the door means water runs drips onto the plastic and runs down.
Get some cheap plastic sheeting, I got a big bag of the stuff you put down when you're painting a room

The way I do it is to cut an extra sheet to half size and stick to the lower half of the door, tucking it in at the bottom. This means that most of the water will run straight into the doors and not pool at the bottom of the sheeting. I stick it down with proper waterproof duck tape, not the cheapo stuff!!