Hey @LeeFritzy ! Thank you for joining the Community and sharing your experience and desired use of Ring devices on your property. I agree this sounds like an efficient setup to cover both doors and more! I'll be happy to answer each and every question you asked:
Hope this helps! Feel free to follow up with any other questions, I'm sure some Community neighbors will chime in as well
I can definitely see your concern in replacing an older floodlight! At maximum, you would need no more than a 1/2 amp breaker.