It comes rooted and you can flash Jetmos or any other custom ROM very easily, which will run your dongles flawlessly. Here is a food tutorial to install Jetmod ( there are other mods too, but in my opinion this is better)
I prefer ES file explorer or FX file explorer both will get the job done of moving the files.
And Rooting is easy just read the tutorial for your particular device thoroughly.
Rooting will not cause the loss of apps or data, if you decide to flash your tablet with a custom ROM then there will the loss of apps and data.