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I reckon you'll need to override this module to register the hook you want. But I'm not entirely sure as I'm a beginner in PrestaShop! And maybe the module is not ready to be hooked somewhere else.

First method is to find the module folder under modules in your project. Under the function install() you should see the hook registration. It should look something like this:

public function install()
{
  return parent::install() &&
  $this->registerHook('header') &&
  $this->registerHook('displayBanner');
}

You can try to add the hook you want. You might need to uninstall and reinstall the module to see the change. Be aware that this solution will be lost if you update the module.

Other way to try to do this and still be able to update the module is to override it.
You can try to add a new PHP file under override > modules > name_of_your_module > name_of_your_module.php

In the file you created, you start with:

<?php

if (!defined('_PS_VERSION_'))
  exit;

class Ps_NameOfModuleOverride extends Ps_NameOfModule
{
}

Then you override here the install function.

Again I'm a beginner so I'm not sure if it this will work.