Unfortunately, my gym does not have round plates (and I literally can’t get a decent gym).
If I set down the dodecagonal plates completely, they roll all over the place and I have to redo the entire setup or pull from really awkward positions.
Alternatively, I just perform touch-and-go reps where I can hold the bar in place myself. That seems to work a lot better than the above.
If you have no other gym options and won’t for a while, you might want to look into getting some hex bumpers. I’ve never used them but they seem like a great solution to the ol’ hex plate dilemma.