You can add a "Book Now" call to action button to your Facebook page that will directly link to your Full Slate landing page.
First, log in to Facebook and navigate to your Facebook Business Page. Click on the blue “+ Add a Button” on the right under your cover photo. Select “Book our Services” and then “Book Now” for the button text, but you can choose from any of the options here. Once you click on “Book Now”, you’ll be asked to add the link to the website you want the button to go.
This is where you enter in your landing page address which can be found in your Full Slate account under Web --> Landing Page. Click “Add Button” at the bottom, and you’ve got a handy “Book Now” button on your Facebook Business Page.