That link is for a reverse camera and looks mega hectic to install to be honest.
I have fitted parking sensors to my car and it was really easy and they work as well as the standard sensors i had on my BMW, And they only cost £16 delivered.
My car is a saloon but im sure the process will be pretty much the same for a tourer, I will do my best at a guide for the saloon (im sure it will be almost identical for the tourer)
TOOL'S NEEDED
Drill
Masking tape
Tape measure
Level
Marker pen
Scotchlocks
Screwdrivers.
In the kit you buy you will get a hole saw and everything else you need.
Ok, Using your tape measure take a measurement 24 inches from the floor to the top of your bumper, This is the hight of your sensors (tourer may be different).
Now with the masking tape, Tape across the lengh of your bumper at 24" in height. This serves 2 purposes as it allows you to mark the sensor position's and protects your paintwork when you drill the holes for your sensors.
Try and be on level ground when you take your measurment for the hight of each sensor.
Now you have a surface to mark the position of your sensors, First locate the centre of your bumper which is easy as the boot lock catch is directly in the centre of the bumper so just put a line at this point, Now you need to measure 200mm left and right from the centre which will be the position of your inside sensors. Now measure 400mm to the outside of your bumper for the outside sensors.
It should look something like this.
+ 400mm + 200mm(centre)200mm + 400mm +
Now drill. Try not to panic as you have to be using a jack hammer to damage the paint. If your drill has a speed control use the lowest speed if your nervous.
Thats the worst bit done.
Now remove the bumper, 3 Philip's head screws located in each arch and to 10mm bolts located under little covers next to the light clusters (use a flat head screwdriver to lift the covers off)
Unclipp the bumper around the rear arch's by pulling on the bumper (dont panick just tug) then just pull the bumper away from the car. The accord has the easiest bumper i have ever removed.
Behind the bumper you will see a couple of rubber grommets either side, Cut a hole in the grommet in the drivers side as this is where you will feed your cables.
Push your sensors in to the bumper and feed the cables through the grommet you cut a hole in.
There is a plastic cover (trim) between the lights on the inside of the boot, This just unclips, Just give it pull and it will come away.
Now you are ready to connect your module (the brains)
Remove the carpeted side of the boot on the drivers side by unclipping the plastic lugs (flat head screw driver will do) including the lug behind the rear seat.
You will now see a white plastic box directly behind the drivers side rear seat with cables in it. This is where you will take the live feed for your sensors. You will see 2 green cables. You need to tap your positive cable in to the solid green cable with your scotchlock.
Now you need to connect your ground cable to the car.
at the front of the boot you will see lots of cables grounded to the car, Just unscrew the 10mm bolt and stick your ground cable amongst the bundle.
Now all you have to is connect all your cables to the module and position the beeper where you want to, i put mine at the top right of the boot behind the carpeted trim (just stick it to the body with the supplied double sided tape.
And thats it, Your good to go.
I have used some pictures from a previous install on my Vectra and a few i found online for the wire cables etc.
The Black Accord is mine with the sensors installed so you can see how factory they look. And to be honest i prefer mine to the factory sensors as they sit flusher to the bumper and are hardly noticeable unless your up close.