When dealing with 120v AC 15 or 20 Amp
Many people make the comparison between a .59 cent Home Depot Duplex Receptacle and something "Locking".
The same is true for IEC connectors.
I use Hospital Grade Plugs, Receptacle, and Switches,(Also sold by some Home Depots) they cost about 10 times more then the cheap stuff, However they stay put when you plug things in ( and last a long time).
If someone trips over or gets something hooked on a cable, the last thing I want
is a small piece of plastic sticking out 4 or more inches, waiting to be snapped off.
If Edison plugs and Receptacles are loose or falling out, Replace them with good quality parts.
The same can be said for IEC Plugs and Receptacles.
I carry a few spares, but its nice to know replacements are close by.
I have gone to venues that a wall outlet has been broken , $6.00 and 5 minutes later, Power.
Just my opinions on keeping it simple.
John