I have a room with three cabs.
My electrical installation here is great, properly grounded.
So I installed a line filter with 5 outlets, one with fuses, plugged all three cabs to it and bam, works like a charm.
I once plugged a big ventilator to it as well, with all 3 cabs on, no problems :-)
Just make sure yours have fuses so it burns the fuse when something goes wrong and pulls too much amperage!