I just downloaded this and I actually really like it. I hide my dock and have multiple monitors/windows open and often need to close things in random windows and instead of clicking/swiping/CMD+Q'ing everything I can just use Alfred
I'm going to move this to the Workflow Help & Questions forum, as that's where it belongs.
I'd also like to refer you to the thread on asking for help with your workflow. The TL;DR is: if you want help with a workflow, it's usually best to post the actual workflow so we can see what you're talking about.
Here's a guess at one way you might do that (no idea if it's appropriate without knowing your workflow):
If all your websites are using the same software (i.e. the CMS login page is always at the same relative URL), just add a second Open URL action after your List Filter and add the appropriate relative URL to {query}. Then double-click the connection between the action and your List Filter, and set it to run when CMD is pressed. That way, ↩ opens the website and ⌘↩ opens the CMS login page.
If that's no good, please post a copy of the workflow, so we can actually see what we're talking about. Make a copy and fill it with dummy URLs if need be.