Dendrobium Parishii Potting / Care

[Nominder]

Just received Dendrobium Parishii.

The plant is good and matured.
please have a look
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It is plastic mounted.
The roots look green in some areas and white in the remaining areas. What color do these roots suppose to be?



I live in a hot climate. Is it a good idea to pot it with some fast-draining medium so that the plant can have some moisture throughout the day? . But is it a good idea to mount hang the plant? Should I water multiple times in summer if mounted?

How frequently this should be watered?

How to start caring this one in the right way?

There is a Keiki (?) with some roots. Should I do something for that?
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Too many questions
Thanks in advance