Supporting the cable does NOT "obviate" anything. Unless your rig is laying around in the floor collecting dust, never touched. An actual solution would be for some genius to invent a locking plug that accepts 8-12 awg wire.
https://www.amazon.com/Rewireable-IEC320-C13-Accidental-Unplugging-Disconnections/dp/B01DCFVXKK/ref=...
https://www.amazon.com/Rewireable-IEC320-C13-Accidental-Unplugging-Disconnections/dp/B01DCFVXKK/ref=...