What are these optical drive bays you speak ok? Do you mean the 5 1/4" bays used for large fan controllers and res'?! 
Regarding vertical drives... If you take a CD-ROM apart you'll find a 'spindle' that the disk is held against the motor when it spins by magnets (from both sides), meaning they can spin and read discs from any orientation.

Regarding vertical drives... If you take a CD-ROM apart you'll find a 'spindle' that the disk is held against the motor when it spins by magnets (from both sides), meaning they can spin and read discs from any orientation.
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