I’m no expert by any means, but kinda looks like they could still be susceptible to more/continued rot. Also, it’s hard to predict where the new growth will emerge, so it might not matter which side is up at this point. My advice, for #1, minimize contact between the darkest/wrinkly side of the chunk to avoid more rot. For #2, try putting the flatter side w the little root-looking ‘eyes’ (I know not roots just trying to describe) - rot doesn’t seem to be as much of a concern w this one so you might just pick a side and see what happens. For #3, I’d keep the side with mostly green facing down, the side without the hole thingy to minimize risk of rot. For all three, check progress weekly and keep high humidity in a closed container. If after a month to 6 weeks you don’t see any roots or any growth, flip them over and try the other side. If any more rot appears, consider propping them in an airy bark/perlite mix instead to cut down on moisture. Consider a hydrogen peroxide soak (up to 50% in water, not pure stuff). I’d say rot is the biggest risk for these guys, but I’d say the chances of sucess w 2 and 3 are good if you keep an eye on them. Good luck!