Tolumnia on holey rock?

[Laticauda]

I'm new to Tolumnias and recently ordered some from an orchid store. I saw someone here posted a Tolumnia rooted onto a piece of lava rock (a pretty big one) and really liked the way it looked.

I don't have any lava rock of that size but I do have Texas holey rock (limestone). I was wondering if the calcium content may be detrimental to this genus or if anyone has tried it themselves. I have the perfect rock for this so I'm really hoping someone here will say that it should be fine, lol.
Thanks for any insights, inputs or simply musings of the orchid grower.
The photos are of the same piece, both sides with a mechanical pencil for scale. What do yall think?