Customer support instructed me to try posting here our question.
As a company we are trying to expose our backend for Hotel Concierge (which is actually frontended by smrtphone apps and chat bots) through Alexa.
We already set up the skill which is working as wanted.
We were trying to understand what solution would fit our scenario the best, where we could have tens or hundreds of Echo devices for single hotel (one per room) and we don't know what account we should open (one account per device or even per 7 devices is not a viable option).
Also we need to understand how to isolate every devices so that they cannot intercomm with each others and individually play music without giving out playing information about other devices.
Alexa for Business could seem the way to go, but still, we are unsure about music and intercomm.