@mitch2 Oh, never saw those cable cradles before. A better option, IMHO is the 90 degree hospital grade plugs. They can be rotated to any angle, so pointing 45 down lets them avoid leveraging the plug out of the socket and leaves room for another below it. They also save a lot of floor space. I replaced the plug on my Furman voltage regulator and was able to snug up bass traps to the wall in front of the socket.
I have found that they do greatly increase the insertion force required due to the extra thick pins, hence the recommendation for outlet supports. When I first tried inserting it I found the outlet, which I previously thought was fine, had too much play in it when I tried using it.
They don’t have to be babied to stay in. Not sure what the maximum cable thickness is though.