Routing speaker cables

[Wombat2]

Not interested in a discussion of the merrits of my choice of cable - just how to get it from amp(s) to speakers. I am setting up a tri-amp surround system and will be using plain ol' figure 8 lighting flex. I'm be running it under the floor in most cases so it will be out of sight for the most part. Because each speaker is tri-amped there is 3 pair to each speaker.

Should the 3 pair be plaited, twisted or run as three separated parallel strands? Bear in mind there will be power cable near some of the runs under the floor.

Thanks for advice

David L