Multiple Macs, One display, multiple displays and multiple Macs

I have two macs. A 27 Imac that I run with three monitors. This works great but. I want to run my second computer (mac mini) On one of the three monitors while using the same keyboard and mouse as the Imac. While doing this I also want to still run the IMac on the remaining two monitors? I am somewhat familiar with "Synergy mouse and keyboard software" but have not tried it yet. I am aware that this will not fix my issue of multiple computers with a single monitor issue. This, I think can be achieved with a KVM switch. Is there an elegant way to make this work that wont involve physically switching cables etc?

via ehMac.ca http://ift.tt/2oS1zVs