Heavy power cord

Try it on other components. When you figure out what combination sounds best then use cable elevators to support all the power cords so they are up off the floor. Do this with all your cables and interconnects.

Cable Elevators btw is a specific product, which turns out to be just another generic ceramic insulator, which are sold all over eBay and work just as good.

Cables that are stiff, relieve stress by bending to fit the location.

So first you get improved sound from everything no matter what. Then as a bonus you get everything supported putting less stress on connectors. Two birds, etc, etc.

Don’t hesitate to improvise by making your own suspension device if needed. My cables are hidden from view behind a curtain. I ended up suspending several cables with 1” leather straps and heavy fishing line connected to the back side of the curtain rod. Completely seamless and inconspicuous. Took all of the stress off of the IEC connections. Good luck figuring out you solution!🍀

I have some heavy and thick power cords and no single one of them is unplugging, But if power cable is mostly (or completely) in the air then you need a longer power cord, which will keep majority of its weight on the floor. As well it seems to me that IEC plug is not quality, it's usually pretty firm stuff when quality plug is used and it should not unplug by itself no matter.

If you have your amp up on an iso stand you MUST suspend, prop up, or otherwise eliminate any forces the power cord may exert on the iso device as external forces ruin the isolation effectiveness. The amp must be free to move in all directions of isolation even if the iso stand is one direction 🔛🔝