I've bought several small Neos from Hausermann. They usually arrive in medium to large bark in a plastic pot taller than standard for most orchids - what is called a "rose pot." Sometimes they arrive even smaller, in a tiny net pot with medium bark - which looks large in the net pot.
I never unpot them because they are so small. I do take care to let them get completely dry between watering, even when in flower. I haven't had trouble with root rot; they take off growing. Once they are growing well I put them under my daily water spray system and they continue doing well. But recall there are very large air spaces between the roots.
Remember these are quite succulent, even as small plants. They are more drought tolerant than almost any other orchid. It is always better to wait longer to water than to water too often. You are very unlikely to lose a Neo if the pot/medium combination dries rapidly after watering. Edit: And you never let them be cool and wet.
I'm not sure sphagnum is a great choice for your high humidity. If the plant doesn't have a lot of roots it will take a very long time for the sphagnum to dry out. The basket I see has a very large mass of sphagnum for the size of the plant.
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