The Spectre 3.0 Enterprise Second PSU Mount adds a secondary PSU mounting location at the front of the case. A front mounted radiator cannot be used when a second PSU is installed but Spectre 3.0 Enterprise has 5x360mm radiator mounting positions and 3 of those are also compatible with the MO-RA 360. The second PSU is intended for when multiple GPUs are used and is for powering the GPUs, which means the cable runs can be clean with custom cables running directly into the GPUs. A 90-degree PSU power cable is included so that it can be routed under the case.
Purchase here:
https://singularitycomputers.com/product/spectre-3-0-enterprise-2nd-psu-mount/