(IANAL but...) I’m pretty sure it’s legal to record anything within your own home if you’re the one that set it up. That’d cover placing devices that delegate that recording to Amazon.
So, what's not allowed is to
1. Setup a covert recording device in your house.
2. Go to the store/work/gym/zoo.
3. Covertly record your spouses conversation with her secret lover.
4. Use that recording in court.