AutoResponse Plus provides a feature called a Tracking Tag (TT).

A TT allows you to setup an optional redirect to a subscribe success url and/or a subscribe failure url.  TTs are setup independently from your autoresponders.

Therefore, you can have a TT that indicates a subscribe on your home page, a TT that records a subscribe from a pop-up, another TT that says, the subscribe was from an internal page, etcetera, all in the same autoresponder.

For all practical purposes, the number you can create is, unlimited (32,000 plus).