For e-mail notifications, it's not really possible as a user's e-mail is specified per rule. Whatever IP address within that rule has used up the quota, the e-mail is sent to the e-mail specified in the rule.
For web-browser notifications, using the
Suspended rule trick (last example on the page), you would need to use enable tracking by IP address in the rule's settings, so each IP address has its own quota and only that IP address goes into the Suspended state.