00-acme-single-template.php

<?php

add_action('single_template', 'acmeIncludeSingleTemplate');
/**
 * Includes a custom, single template as included in a plugin. If
 * the template is being viewed for a custom post type then use it;
 * otherwise, use the template that's provided by WordPress at runtime.
 *
 * @param  string $originalTemplate the path to the original template
 *
 * @return string the path to the original template or the custom template.
 */
function acmeIncludeSingleTemplate($originalTemplate)
{
  $singleTemplate = plugin_dir_path(
    \dirname(
      __DIR__
    )
  );
  $singleTemplate .= '/templates/single-acme.php';
  
  if ('acme-cpt' === get_post_type(get_the_ID())) {
      if (file_exists($singleTemplate)) {
          return $singleTemplate;
      }
  }
  
  return $originalTemplate;
}

01-acme-archive-template.php

<?php

add_action('archive_template', 'acmeIncludeArchiveTemplate');
/**
 * Includes a custom, archive template as included in a plugin. If
 * the template is being viewed for a custom post type then use it;
 * otherwise, use the template that's provided by WordPress at runtime.
 *
 * @param  string $originalArchiveTemplate the path to the original template
 *
 * @return string the path to the original template or the custom template.
 */
function acmeIncludeArchiveTemplate($originalArchiveTemplate)
{
  $archiveTemplate = plugin_dir_path(
    \dirname(
      __DIR__
    )
  );
  $archiveTemplate .= '/templates/archive-acme.php';
  
  if ('acme-cpt' === get_post_type(get_the_ID())) {
      if (file_exists($archiveTemplate)) {
          return $archiveTemplate;
      }
  }
  
  return $originalArchiveTemplate;
}

02-single-template.php

<?php

add_action('single_template', 'acmeIncludeSingleTemplate');
/**
 * Includes a custom, single template as included in a plugin. If
 * the template is being viewed for a custom post type then use it;
 * otherwise, use the template that's provided by WordPress at runtime.
 *
 * @param  string $originalTemplate the path to the original template
 *
 * @return string the path to the original template or the custom template.
 */
function acmeIncludeSingleTemplate($originalTemplate)
{
   // More to come...
}

03-archive-template.php

<?php

add_action('archive_template', 'acmeIncludeArchiveTemplate');
/**
 * Includes a custom, archive template as included in a plugin. If
 * the template is being viewed for a custom post type then use it;
 * otherwise, use the template that's provided by WordPress at runtime.
 *
 * @param  string $originalArchiveTemplate the path to the original template
 *
 * @return string the path to the original template or the custom template.
 */
function acmeIncludeArchiveTemplate($originalArchiveTemplate)
{
  // More to come...
}