I just use my own EZPass when I rent a car. Essentially zero effort.
https://www.e-zpassny.com/en/faq/account.shtml
If you don't own a vehicle and wish to open an E-ZPassŪ account on the E-ZPassŪ website, please contact the E-ZPassŪ Customer Service Center at 1-800-333-8655 for instructions.