Please advise - Mounting subtrate recommendation for Macroclinium bicolor

[cbuchman]

I need advice!

A friend gifted me with a piece of Macroclinium bicolor from her award winning terrarium at end of the Philadelphia Flower Show.... and the piece is in bloom and has a few roots. So I'm pretty confident I can make a go of it.

Internet research indicates that it should be mounted and the roots disturbed as little as possible going forward.

What do you recommend as a mount substrate - I have a piece of fine/dense tree fern or would this one do well on a Kool-Log which delivers consistent moisture with great root aeration. Is cork a better choice?

All advice welcome! Please!