I believe the weight is ~ 60lb.
Most zone amps usually have one large power supply to run all of the channels, as opposed to some HT amps that might have dedicated power supplies (including individual transformers) for each channel, so I don't think spreading out the channels would make any difference as far as load balancing power supplies.
But depending how the channels' output devices / heatsinks are configured internally, there might be some thermal advantage in spreading it out? For example if running 4 mono speakers, connecting them to channels 1, 3, 5, 7 ?
Steve