Thanks for posting in the forums! That's a great question! From my understanding, you are trying to connect two Slingbox Tuners to your DISH DVR?
If you could please respond with the model of the DISH DVR you are using, I would be more than happy to help you with the setup process!
Below is a link to an article from our support site that provides additional information:
Feel free to reply!
The Sling Moderation Team