A:AnswerA magnet field will not affect modern screens that are LCD/LED based, they do not have the beam of electrons to be affected by magnets. Magnets used effect two primary things in electronics, CRTs (Cathode Ray Tubes) and Hard Drives...
So if have one of the above mentioned LCD/LED TV's, speaker placement should be what ever looks or sounds best to you.
A:AnswerKlipsch luckily has a rare business model where they strive to keep improving and developing their products while keeping things fairly priced, so you can't go wrong updating and because they improve with a break-in session and with time of use it's just up to you, but I'm very happy that I replaced my Missions with Klipsch.