How to Improve the Search Center in a seperate Site Collection

I have the Search Center on its own site collection.  We have configured a lot of "Best Bets" to be displayed on the search results. However, when a user is on a different site collection, the best bets are not displayed unless the user navigates back to the Search Center.  Is there a way to include Best Bets on all of the site collections without having to add the best bets individually to each site collection?

Thanks!