Sir, what is the advantage of having four(4) eyelets compared to two(2)?
4 sensors have more total area covered.



Required ba talaga four(4) eyelets for safety purposes?
Not necessarily. Remember that you still have your rear view mirror + 2 side mirrors to guide you when parking/reversing. So whatever suits your budget would be fine. 2 sensor kit costs P900 and up. 4 sensor kit costs P1,400 and up.