[Help] Monstera Propagation Roots, Root / Stem Rot / Leaves Fell Off, Fungicide, Where to Burry in Pon?

I am having trouble with propagating my Monstera Top Cut, that came with rotted roots in moss from international mail. See attached pics.

1. Where & how, depth – would you burry or hover the node in Pon?

2. Cut off the roots, they keep rotting (the sheath) – left with a string? Dead tissue around with other root point. Washed by hand, Hydrogen Peroxide. Rotted off Leaf has blackening around stem. Possibly treat with a fungicide?

3. Pon , is their a need to do water prop firstly if it comes from soil then shipped in moss to get roots?

4. How wet should the pon be, I have wicks and a res. I washed the rotting roots with water and sprayed with h20.