The spec sheet for Dell 7920R states that some GPU configs require 2x 1600W PSUs @ 220V.  Will this work at 208V as well?  See the red configs in this attached table, for example two RTX 6000.

I'm also wondering if it's possible to use the "blue" configs in redundant mode with 2x 1600W PSUs @ 220V / 208V.  It says 1x 1600W on 220v or 2x 1600W at 110v in non-redundant mode, so it's odd that 2x 1600W at 220v redundant is not mentioned.