Becky,
Most of the stone coated panels are designed to be installed either on battens or direct to deck. The same hook is used for both direct to deck and batten installs. Some hooks fit better than others so its best to use the one that is specific to your roof product, i would check with the installer or manufacturer to get the correct hook.
The hook follows the roof tile profile even if there is no battens. See attached. Metro Shake profile installed direct to deck with a hook positioned over a rafter.
11/27/2017