Wyze charges what you authorize them to charge. If you don’t want to pay and opt for $0, then that’s all they will charge you. If you sign up both accounts under that scenario, you get your 12-second clips back on all cams.
But if you share, you will always be crippled by lack of control over the cameras. Why not run all the cameras off one account? Even people with vacation homes in other states do that. 