Yes Landing Pages can be hosted on your site. There are two methods:

I-Frame — The iframe is for those who would like to use Real Magnet’s editor to not only create their form, but to design it. In the iframe on the hosting site, the landing page design will look exactly as it does in Real Magnet regardless of stylesheets applied to the page.
Div — The div option is for those who would like to use styles already available to them on their site. So for example, if you have specified widths in your CSS that you use for dropdown menus, those will be applied to your landing page content imported from Real Magnet.