To set up a default parking page for cPanel/WHM server, you need to place your default files in the proper place.
Check /usr/local/apache/htdocs for when a domain resolves to your server but does not actually exist in the Apache configuration file. If you just need a park page set up you can place it in that directory and name it index.php, index.html, etc.
As always, your configuration may vary.
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