No changes for you to incur. We typically design upto 2 landing pages for free , for our clients which are promoted to collect the leads. In this regard, at maximum, we may need a subdomain on your portal, like products.yourportal.com, which will point to one of our IP Addresses / server Addresses.
If there is a need to design more than 2 landing pages, we will let you know the proportionate cost (if any).