Mounting is as much a question of available humidity as it is the particular plant. Whether you'll be growing in a greenhouse, on a windowsill, or in a terrarium will have a big impact on the answer. I don't believe you have a greenhouse yet, but I know you've been using a terrarium. You can also add to the moisture retention by wrapping the mount in more moss. Mounts will do better in a more humid environment - they're tough on the windowsill.
The other thing to consider is whether the plant wants to dry out between waterings or remain more evenly moist. Plants in the latter group would do better in pots.
I don't know the plants on your list well enough to advise you, but many Dends do like to dry between waterings.