If you can, I'd lean towards dosing two part. If not, it'll still work. Like mentioned just make sure to clean your ATO pump frequently and expect a little cloudiness when it's first going into the tank.
Make sure to make note of the business's that are choosing to exploit people in these tough times. I wouldn't spend a penny at any of them for the rest of my life.
Actually new grass seed likes cooler weather. This time of year is perfect to plant grass seed. The cool weather at night and dew in the morning help extensively.
As you said sod need consistent watering.