Thank you very much for the informative thread.
My plan was to start with an 6x 1080 Ti setup. I purchased two of the Seasonic PRIME Ultra 1000W 80+ PSU and a six pack of the risers that have the option for molex, SATA or 6-pin. Each PSU has 3x 8-pin double cables and then 3x 8-pin single cables. Sounds like using that configurdation would be best for the GPU’s and risers. I also have a dedicated 20A outlet that was purposely installed for PC equipment. Hope to be at or under 80% load with 6 gpu’s. Luckily I have a licensed and bonded electrician that will install two additional 20A circuits for $350 if necessary. Let me know if this overall approach sounds reasonable. Thanks!