Very pretty purchase! Thanks for sharing your pics.
Dtps. stands for Doritaenopsis. It's an intergeneric hybrid between Phalenopsis and Doritis pulcherrima. The flowers tend to be a bit smaller, more boldly colored and on upright, branching spikes moreso than the Phalenopsis parent.
Your photos show happy healthy roots, not keikis. Phal roots (and Dtps roots) are a bit haphazard, and some don't mind wagging about in the air. In fact, most of my phals and dtps's have aerieal roots. It's what they do.
Good luck with your plants!