One of the best places for an AED is where you spend most of your time, your home.
Not down the street, not on a ambulance. Not minutes away when seconds count. They are not too expensive, given the alternative. About $1,300, several variants available.
https://www.amazon.com/Philips-Heart.../dp/B00064CED6
Of course public locations are great, I prefer to increase our chances and so should you.