Most are 1 and 2 bay chargers that are usb, but a few I've seen that are 3 or 4 bay support 4x.5 per bay.
There are some rated higher, but as with all things a bit more expensive. I think the charger you're looking at is excellent and will serve you well. Get a decent wall wart and you should be all set. You're miles ahead safer than charging in the alien.
And you don't have to worry about breaking the USB port on the mod, which are usually a real weak spot on mod boards construction.