D20 - what to look out for

I am a new D20 Pro Plus owner and am learning how to use this effectively (so it doesn't need a lot of attention). One of the problems I am having is throw rugs. I don't know if the edge of this rug had been frayed initially, but the D20 tried to eat it and choked on it. Granted, this could happen with any vacuum with a beater brush so I'm not faulting the D20, but in general, how do people use these robovacs so they can run independently on some schedule without needing human intervention?