Speaker setup experts please?

Are there any "rules of thumb" when it comes to placement of speakers in a listening room? For example, does toeing out widen soundtsage? Does on axis make the images larger or smaller? Bass response? I have also heard the ideal positioning of speaker/listener is 1/3rd-1/3rd or 1/5th/1/5th. Any consistent truths out there? BTW I have Wilson Maxx 2's. Thanks in advance.