I would like to have the remote option for my Fusion amp setup, should I buy 1 or 2 kit’s?

In theory, a remote kit can be added to every Fusion Amp. For a stereo setup, 9 out of 10 configurations will be connected as master and slave, where the master provides the data to the slave for audio signals and controls. In this case, it is not necessary to have two remote kits. However, you still have the option to use two remote kits if you wish to have a LED indicator in both speakers to show activity.