Length/direction of Dracula spikes

[critterguy]

Just wondering-what controls the length and direction of Dracula spikes? I am growing D. cordobae in a terrarium and considering having it switch places with D. mopsus.

I've seen pictures that seem to have flowers oriented in a variety of directions. Usually the flowers are growing downward on fairly pendant spikes but some photos I've seen of flowers growing straight ahead or even somewhat upward. I have the cordobae near the back of the tank and am wondering if the spikes will grow towards the front of the tank or if they will just go hide in shame somewhere in the greenery.