How many doorbells or floodlight cameras can you have on one account?
Good question @HWilson! There is not a limitation in the Ring app for number of Video Doorbell or Camera devices. The only limitation to keep in mind will be the bandwidth, speed, and connection capabilities of your home network/ wifi. While many Ring devices can be added and setup at your location, keep in mind the resources each will require to live stream video and operate as intended.
This answer is in regards to Cameras and Doorbells specifically, but I’d like to add that only one Alarm Base Station can be added per location. I hope this helps!