when you install them, put them to fully negative camber. This will net you the best handling, crispest turn in and nicest feel. If you loosen the lower bolt, but tighten it to take out the slop enough to allow movement, then rotate the 14mm bolt head(the one that turns the cam) the camber will change visually. Now, put a large flat bladed screwdriver into the top rotor vanes so you have some leverage on the rotor. If the rotor is loose, put on a couple of lug nuts to hold it. Now, exert pressure on the top of the rotor with the screwdriver while you adjust the camber. When it is in as far as it will go(negative camber, rotor top inwards), snug up the camber bolt, then tighten up both bolts.
Tell the alignment shop to do thier best in the back, and set the TOE ONLY up front as you have the camber where you want it. If they give you any BS take it somewhere else. Tell them you know the numbers will be in red, not green, but those are the specs you want. Have them set a VERY minor amount of toe out in the front. Just a whee bit. This will give more crisp turn ins without any undue tire wear. Toe in makes the car feel minivan sluggish. Too much toe out and it will scrub the tires, but a little bit makes it nice safely.
Its toe that wears the tires, camber CAN exaggerate the wear as its concentrated more on one side of the tire, but its the toe that does it, not the camber. Well at least not at this little level.
you will probably see roughly 1.5deg negatiive camber if you get all the adjustment provided by those bolts.
I have done this on at least 6 1g dsms and probably 25 or so other cars. The shop I work at has an alignment rack so we do them alot. I have 2 of my own that I have owned for 4 and 8 years respectively and have the negative camber set like this and the tire wear is always even.
The rear is another story...