Hi Gary,
Merged your posts. As you can see from above you do need a computer for Roon, but it can be in another room with your router and stream to the Aries. Your music storage would need to be on the computer or router, not the Aries.
The computer has to be on to listen through Roon. A mobile solution for Roon is in the works but is still some way off.
See here for iPad requirements. Later iPads, such as the Pro, will also run the app.