I removed the bumper to fit mine. Its really not that much effort for the peace of mind. You can also cable tie the sensor cables out of harms way.
Just one regret for me. I fitted my dolphin sensors in the pre-marked positions that you will see if you remove the bumper. However because this section of bumper above the chrome strip is not vertical, the sensors will not detect anything below 500mm. If I was doing it again I would fit them below the chrome strip.