Unbounce is committed to building a platform for landing pages used in non-organic marketing campaigns. We currently don’t offer the ability to add your Unbounce pages to your website’s sitemap.
Typically you’d publish your Unbounce landing pages to a subdomain of your site, and use those pages for your PPC, email, social, webinar, ebook campaigns etc.
Your homepage is generally still meant to be it’s own thing. For example, our homepage (unbounce.com) is powered by WP, but we use or own tool Unbounce for landing pages. For every marketing campaign we run we drive a portion of traffic to a dedicated, stand-alone landing page. An example would be webinar.unbounce.com.
PS I’ve opened up a support ticket so I can better learn how you’re driving traffic to your landing pages! Check your email!