In a 1-3-1 defense your quickest player is at the bottom, to cover the corners, to run baseline on defense - height is not a major issue at the bottom, you want speed. Your quickest LONG defender plays at the top of the 1-3-1. Your LEAST mobile player is in the middle at the foul line.
So, a couple of years ago, Mag played the top, Omoruyi was in the middle, and Baker or McConnell was at the bottom, with Mulcahy (and his length) at one wing and Baker or McConnell at the other wing ... great length at the top and wings for traps.
In your hypothetical line-up, Martini would 100% be in the middle and Williams or Harper might be at the bottom with Bailey or Williams at the top and Hayes and whoever is not at the top and bottom at the other wing.
But, frankly, that is not the best line-up for the 1-3-1. The best 1-3-1 line-up probably has Bailey, Davis (Davis at the bottom chasing - quickness and speed being more important than height in that role) ... Martini or Ogbole or Somerville in the middle ... and I think Derkack or Williams would be fine on the wings ... maybe Bailey or Williams at the top. OR ... this could be a role for the 6'9" to 6'10" Dortch off the bench at the top or the wing ... for his length and athleticism. Hayes would NOT be a good fit in a 1-3-1 defense.
Just saying ...