Any anti vibration tweaks are good.The power cords at right
angles is a good idea also.If it can't be done,the next best thing to do is keep a good distance between them.Run power cords down one side of your rack/shelf,interconnects down the
other side.That helps keep the AC power,that may have radio frequency interference out of it too.The manufacturers have a lot of filters blocking that in the power supplies.Doing your part
to help usually pays of.The manufacturers are big time tweakers' with their budgets,plus they don't know your listening environment like you do.
angles is a good idea also.If it can't be done,the next best thing to do is keep a good distance between them.Run power cords down one side of your rack/shelf,interconnects down the
other side.That helps keep the AC power,that may have radio frequency interference out of it too.The manufacturers have a lot of filters blocking that in the power supplies.Doing your part
to help usually pays of.The manufacturers are big time tweakers' with their budgets,plus they don't know your listening environment like you do.