Montanadolphin you cam use what ever you want to hold the eggs still as long as they can breath and dont mess with your humidity and temp too much. As for burning jeads off should be fine i would think. Cause it shouldnt get much hotter than the 99-101 temp your bator is at. Also 1-3 day olds dont jump so much as climb. So shouldnt hit it. As for far end up i use an egg turner and mine sit that way from day 1 so i use a carton to hold mine. I've never hatched without it so someone else will have to chime in on that.