Depending on what cameras you have, you don't have to have a subscription to use all the devices. If you want them on one account and to have the Arlo smart features, yes, you'll need a sub. The workaround is to put each set on a different account and grant access from one account to the other with Access Rights. This gives you view and almost all control over all cameras from one account at no charge (for Arlo, Arlo Pro and Arlo Pro 2)