How do I point to a particular installation of simplesamlphp with the simplesamlphp_auth module?

I am trying to integrate our company’s SSO into our Drupal installation. As a POC to see if it even works, I have a copy of the SimpleSAMLPhp Library located at /foo/bar/simplesamlphp. I configured my apache vhost and the SAML configs and that’s all fine for now.

Per the instructions from Acquia on this page, I tried installing the drupal/simplesamlphp_auth module.

composer require drupal/simplesamlphp_auth 

This installed the module and as a dependency, installed a second copy of the simplesamlphp library in vendor/simplesamlphp. Now it looks like the module simplesamlphp_auth is using the installation in vendor.

How do I configure this module to use the one I already placed in /foo/bar/simplesamlphp? There doesn’t seem to be any options on the page /admin/config/people/simplesamlphp_auth.

I have configuration files that I would like to avoid copying over to the vendor directory after each deployment if possible, since that’s not as secure as keeping the configs outside of the project altogether.

EDIT 1

Clarification on the configuration files: I need to define configuration files in /foo/bar/simplesamlphp/config in order for it to work. These configuration files are missing from vendor/simplesamlphp/config and without them the application encounters a fatal error. As stated in the Acquia document above, the library lives outside of vendor/ or docroot/ in their setup.