No you shouldn't be running positive camber for a street car.
Yes, it is suitable for a straight line car. However, when going around corners, the vehicle actually needs some negative camber.
For example, when turning right, the outside of your left wheels will be the ones taking most of the wieght of the car, if you have positive camber, it will reduce the amount of tyre surface on the road.
You need SOME negative camber to compensate when turning in order for more tyre to touch the road surface.
Sorry if I explained it bad, maybe someone else can do a better job.
Ultimately, the choice is yours. If you put in positive camber at the rear wheels, you're going to be oversteering if you're giving it around corners and stuff.
However, in the straight line, it will be better.