If you have a Slingbox 350, Slingbox 500, Slingbox M1, or Slingbox M2, we do have other options for you. Though we do not support those older connected devices anymore, we do support the Amazon FireTV/Stick, which does have an integrated application like those devices did. This is not an expensive device, but will still give you the quality you are looking for without needing a mobile device. I'll link an article below that goes over a bit more of the intricacies of the device and its use.
I hope this helps!!
Sling Media Technical Support