Multiple Email Accounts OS X Mail- Combine Junk/Spam?

For years I've had multiple email accounts that I read using Mac OS X Mail. If I want to check the SPAM or JUNK folders, I have to go into each account and open those specific folders to clear out all the SPAM.

How can I make it so all of that email goes to just one Junk mail folder? I mean, I can peruse through all of my regular inboxes with one folder, so I feel like I should be able to do that with Junk too.

What I've tried: Going to Preferences-> Accounts. Clicking on each account -> Mailbox behaviors -> Setting the junk mailbox to different folders (currently set to the one on my Mac)

Under Prefs-> Junk Mail, Performing a custom action (Advanced) to move junk to "All Junk"