unity subscene with player prefab work?

Hello,

So I have been watching some code monkeys:

and wondering, I plan to create several prefabs for the player to choose, which each prefab is just a skin of sprite sheets, and my only concern is… when the player prefab goes from one subscene to another, how will I instantiate that player prefab on the new subscene in the correct spot? example

subscene 1, player prefab goes to the bottom of subscene 1, and subscene 2, will the player end up at the top, or will i have to instantiate and do something to have it “Begin” on subscene 2 at the top of subscene 2?

hmm Also, i was thinking… maaaaybe instead of using Dots/subscenes… i was thinking of making a level, THEN when a player hits a trigger… it loads that level… any thoughts on that? trying to cut down on memory for performance, though yes mobile phones are not hurting of memory or cpu, however I dont want my game to hog the memory etc. when loading a BIIIG world, when really i can just load a bit at a time… with prefab levels, i guess maybe thats what i would call them? is that possible or has anyone tried that?

going to look into this.