Controlling multiple rgb led strips in different zones with remote simultaneously
What you're looking for is an amplifier.   It works like a controller, slaves off another controller.   You send the power output of the controller as a signal to the amplifier.  The wires can be quite thin since they take no appreciable current.   

Trying to sync using wireless remotes is hopeless.  Controllers don't always get the signal even when you are aiming directly at them.  Two distant controllers, no chance they'll stay in sync.