I made a simple junction box with a single flexible inlet cord (DH Labs PowerPlus) to the wall outlet. It feeds the J-Box with a Neutrik PowerConn (locking!). The J-Box now has all PowerCons on it, so I then re-terminated all of my cords with PowerCons. I'd never go back. They have 32A and 16A versions and are very inexpensive compared to most IEC hardware in the audiophile market.
I can't say there is a sonic benefit as I changed a lot of stuff, but it is definitely no loss and I never worry about whether they're tight or not.