Hi Folks,
Here is an interesting youtube video of I suppose a Dragonfly type multiple telescope setup using two Celestron RASA 8 Telescopes on an EQ8. The video explains that it is designed for parallel data collection (Like the Dragonfly) as well as a splayed arrangement to facilitate faster mosaics.
I'm not sure if he's a member here, his name is Steve Morris. (Cheers for the video Steve)
I too have been on the job (for too long) with something similar with multiple fast 600 & 400mm lenses... one day.
Best
JA