REverse sensor for 2002 CRV sport

[RCS 20L]

I have a 02 CRV sports. I want to put some DIY reverse sensors... Mobile installers want $300 to supply and fit. I got mine from ebay for $50 bux, 4 sensors with display.
My question is where do i drill the holes for the 4 sensors? The spare tyre is in the way... I tried to ask the mobile installer, he doesnt seem interested to tell me. Please Anyone with them installed to there CRV with pics will be a great help? Thanks in advance!!

[Alpine]

Google is your friend!

http://reverseparkingsensors.co.uk/g...honda-cr-v.asp

Some pics are there to give you ideas.

[kogarah]

The hole position should in the bumper. you need to adjust to make sure the sensor are 90 degree by the ground.

the wire are through the little hole under the picnic table: there is a black rubber cover at the left back side can be using.