Antminer hashboards to an immersion cooling rack

[Observate]

 I saw either a thread or something on Google earlier that I can’t find the life of me anymore. Someone was saying how it would be a good idea and explaining how to move and mount hash boards to sit on a rack mount inside an immersion cooler.  He was saying something about some sort of thing you put on the board itself, and then something like a grounding clamp or something that you solder to the rack.  I am most interested in what it was that he put on the hash board to make it easier or safe to rack. Does anybody have any ideas on how to accomplish this? And also on what the thing was that was put on the hash board?