Hi. Sorry if this has been talked before, but I couldn't find it. I'd like to know if there's something like a voltage regulator or uninterrupted power supply that can be rackmountable. I mean, most tof these devices (the ones I know) are made thinking of home or office usage, but not to be carried along with an amp and cab in a convenient way. Could you please point me to some good options in case that such a thing is available? Thank you very much in advance.