This is possible, but in doing so, the submitor will be able to submit as many entries as they would like, all submissions would have to be moderated and submitor will not be “linked” to the submission so they will not be able to maintain it.
To do this, follow the Form instructions for adding the “Submit Entry” link.
The navigate to your directory page, copy the URL for the submit entry link.
You can use this URL on your landing page.
You can turn off the submit entry link if you do not want it above the directory.
Hope this helps!