First off the raspberry Pi corporation has not realeased a model "3+" so assuming that you are using a model "3" the power requirements from the official FAQ located Here state that 2.5 amps is the recommended USB power supply current capacity. Which is higher than the 2.1 amp supply that you have which means that you should likely upgrade to a power supply capable of delivering a higher amount of current. Also I would personally recommend that you stay away from off brand power supplies as they aren't usually designed to operate 24/7 and are usually unreliable. Furthermore to answer your second question if your Pi has low power for an extended amount of time you may face unexpected shutdowns which can corrupt your SD card. If you wish to remove the low power warning without changing your set up you could also try lowering the clock speed of the Pi, google "disabling turbo mode on the Pi"
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