Using a Smart DNS is a bit more complicated than downloading VPN, but the great thing about it is that you don’t need to install extra software to your device.
It will allow you to create your own private network which would make it hard for Sling TV to figure out which part of the world you’re accessing it from.
See also: How to get Sling free trial If you’re outside of the US, you can’t even access the site of Sling TV in certain countries.
All you need to do is install a VPN or Smart DNS so that Sling TV’s geo-locator cannot track down your IP address.
So if you want a better option to support these devices, it’s better to use a Smart DNS instead of a VPN.