Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Yes, you can have up to 12 Echo devices associated with your Amazon account.
When you activate the second Amazon Echo with your Amazon account, many of your settings from your first Echo will automatically transfer over to your new Echo device.
Settings that can transferred include your music settings, household profiles, Alexa Skills, smart home devices, Flash Briefing settings, and your Google Calendar.
To register it, simply open the Alexa app to connect your device to a Wi-Fi network and register it to your Amazon account.
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