I have one and yes it's safe and you can charge 1,2 or 3 at a time. It's literally a stock charger with an extension bar on it. You can buy the whole unit or just the extension bar and use your stock charger attached to it.
Note that without a an external power supply and higher amp charger all it's going to do is take twice or three times as long as it takes to charge one battery. It's only going to take the capacity of the current charger and divide it by 3.
To charge 3 batteries will take nearly 4 hours with that device. I would recommend buying one or two additional stock chargers. The stock chargers are $39 each, they will charge 3 batteries in a little over and hour, and you have a spare charger at hand. A single charger on that device is going to take a serious beating running for hours at a time at max current.
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