My clan's strategy is simple: I do all the attacks
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I share 6 accounts with my wife and have access to 3 more that are owned by one of the members.
FWIW, it isn't hard to maintain defenseless/low defense accounts. Most time are spent in the early stages of the account, then after that, you just raid when you need to upgrade something. Nowadays I only log in to those other accounts to do war attacks.
Defense is where you spend most of your time upgrading.