I have two places in my bathroom to hang towels so I always know which one is mine and which one is my husband’sthe boys were picky about wanting to use clean towels every time because it could be someone else's.. it's a crazy life for sure.
We put three hooks in the kids bathroom, but also have different colored towels so it is very easy for them to distinguish whose towel is whose even if they don’t hang them up in the correct spot.
Why?Everybody needs their own hamper.
I don’t think the OP has determined that doing separate laundry is the answer to the problem.
And even if she did, she emphasized that no one was going to walk upstairs to put the laundry in their own rooms. I doubt they have room for four separate hampers in the bathroom. So everyone having their own hamper that they are not going to use is not a solution to them leaving clothes all over the bathroom.