I aksed DH this, he said you can't under the same account, but you can sign up multiple accounts as long as the email and address are different.
Email address change I can understand, but are you saying you must also have a different home address? Won't they check that when they run the credit card and won't it be declined if the address is different?
Also, are signing up for different book clubs ok? If I sign up for book of the month is it ok to then sign up for history book of the month or kids book of the month and still get my points and cancel?
I would assume you have to use a different credit card. I've signed up two accounts using two credit cards with a different billing address and email, so that's all I know.
And you can sign up for different book clubs, I've signed up for the regular and history. Just don't do the history one. They won't let you cancel.