For the ultimate traction, tire chains on all 4 tires would be optimum . However in reality – most people use chains only on two tires.
Two wheel drive vehicles would only use snow chains on the drive axle. If you have rear wheel drive, the tire chains would go on the rear tires. Front wheel drive – tire chains on the front only.
For four wheel drive vehicles, snow chains normally go on the rear axle. However, some four wheel drive vehicles require tire chains on all tires to prevent drive-train damage. In extreme off-road conditions, tire chains should be used on all 4 tires.
Each vehicle is unique. Therefore, for a definitive answer, look in your owners manual under snow chains or tire chains. The manufacturer will recommend placement for your vehicle.