So with the use of multiple Amazon accounts in order to achieve "room support", there are a few downsides.
1) If you ask Alexa to add something to your list, its a different list for each account.
2) Any other skills that were set up, e.g., Sonos, need to be explicitly added to each account.
3) Interaction with Amazon now goes to a different account, including Amazon prime stuff.
I choses to scrap room support, so I never bothered to test if Sonos works with both accounts, but I assume it would.
Does anyone know if there's a way to achieve the room support without incurring the issues of multiple Amazon accounts for other functions besides Smart home stuff?