Spectral dma-90 and MIT Z center

Spectral'says website say their amps should be plugged into a different circuit than everything else. The DMA90 instructions says plug it into the same account outlet as preamp. I have mit z center. Should I plug the amp into the unswitched outlet marked for amps? I have the preamp in the switched section under preamp. Is that okay or do I need to have the amp in a separate circuit which will require an electrician.