We set up a page that has links to multiple signup options, and each of those redirects to a unique page that gives them the form.
The benefit here is that everything stays ON your site, so they don't get redirected!
We could put ALL membership options on one page, with multiple subscribe buttons.
The benefit is we don't have to build multiple pages, but the downside is it redirects people away.
The button would look like this (it might be customizable)