Combining AC outputs of Inverters in Parallel

[brclark82]

I currently have a Victron 24V Multiplus II 3000va 2x120V and am considering adding an additional unit in parallel. I have read the manual and understand everything about how to actually setup the inverters to work this way, as well as what I need to do to properly connect the batteries, but I cannot figure out the best way to combine the AC outputs of the 2 units. The manual has zero info about the AC side of the install and the diagram just shows a junction combining them.

I have some assumptions about what I could do but was looking for feedback and ideally actual parts and links to what you would use to accomplish this.

Thanks