NGL they probably wont like it. Main thing I'm suggesting is make sure they have enough depth to begin with cuz if that initial tap root hits a wall it's gonna stunt it in the long run.

I transplant seedlings by filling around an empty seed pod and then putting the seedling into the fitted hole. I find that is the gentlest way to transplant.

They'd probably not do well getting transplanted from a snail roll. I went a bit off topic there.

That is 100% dependent on the seed variety. Some want to be on the surface, some just lightly covered, and others want over an inch of soil above them.