Excellent

Take the shuttle bus directly to the car rental company.

It's okay. After getting the order, you'll be directed to the car's location. The key is already in the car. If the gate guard checks the vehicle and finds no issues, you can leave directly. A friendly tip: don't rent an electric car. If you arrive at the airport with a fully charged electric car, there will be an additional charge. I was charged an extra ten dollars.

Only suggestion would be for the staff to tell me on pickup where a nearby gas station is for dropoff. Gas stations are hard to fond in Manhattan