Amps in stereo (physical amps)

I guess this question has an easy answer but I don't get it. To avoid ground loops and phase issues in a two amp configuration, something like the Radial Bigshot seems to solve that problem.

But if I want to use the stereo outputs of my AX8 straight to the two inputs of the amps, do I need two Bigshots? I'm asking because it only has one input. Or do I need a different device for this application? Thanks!
 
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