Hello @FirstNameL9705240. Thank you for reaching out. When it comes to user roles and permissions in accounts, only the Account Owner can control and see the billing information. If you are looking to have someone be the "Account Owner" but not have access to that area of the account, you will want to assign them as the Account Manager. They will be able to see and print invoices and statements but cannot make account changes like editing how the account is billed or adding/editing users. You will also want to update the My Account area to change over the Account Email to the user who will be considered the "default" from address and update the Billing information to have you be notified instead.
With all of this considered, you mentioned you would be managing multiple accounts and you are correct that email addresses cannot be used across multiple accounts. It may be worth contacting our Partner team to see what options are available through our Partner program
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