Thanks for all the feedback! I can confirm that the plugs are tedious to use, and they were a pain to code. I probably would have made them better if I had more time.
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I suggest using raycasts to determine how to place these things. If it hits the ground, just place it correctly on the ground and disable any physics to ensure predictable placement. If the raycast hits a plug at a close enough distance, place it there too. Maybe just make the plug hit box a bit bigger