For ‘music’ playback I personally prefer to use the Fives in a vertical position, with tweeters on the outside (slightly wider more diffuse soundstage), rather than have the tweeters on the inside (a slightly sharper stereo image), but I will also just add I much prefer to listen to a ‘stereo pair’ in front of me, rather than behind. So I have purchased an additional pair (+Sub) for that purpose.
For TV surrounds, I have long(ish) rectangular room. I have opted to put two Fives Horizontal, mostly because the Wife preferred the look of them in that orientation. I understand a horizontal speaker will output its ‘music’ audio over a much wider soundstage, but I’m not sure
that applies/makes any difference when using them as TV surrounds.
I guess the answer is to try the different orientations and see which you prefer for TV/Music playback in your room.