So has anyone gotten and installed the Rear Bumper Cover or Rear Seatback Protector? also what's the different between the Cargo Tray and Rear Seatback Protector other than the Protector covers the 3rd row back seat. Currently using a double stroller and don't want to scratch the rear bumper so i for sure want to get the bumper cover but will that get in the way of the seatback protector or cargo tray installation?