This lily actually looks awesome and gives an aesthetic view when planted as a shrubbery border or in a rockery.
These can also be used as floral edging.
But I found one thing problematic about rain lilies is that they scatter their seeds in the garden and if you have no spacing between these and the other plants, it will grow in their place as well. This causes problems like a weed and hampers the growth of other crops!
We have mint(pudina) near to these lilies and lilies have spread in mint space also.