LSN - is it a global indication all across the instance or per DB value

I need to restore many DBs to the same point.

I know I can restore them with stopAt time, but I'm afraid I could lose some transaction that would happen in that exact time.

I think using the  STOPATMARK = 'lsn:xxx' is more reliable.

My question is if I can use on LSN for all DBs, meaning, the LSN is global to instance and not per DB. right?

if I restore all the DBs to the same LSN, this means that I get all the transaction that occurred all over the instance in all DBs before this transaction, right?