Ribbon mic are usually condensor mics (need power to the mic to operate it). You have Dynamic mics (operates off of electrical signals generated by the mic's pickup coil movement).
Just place the mic between the two drums and leave it at that. Anything you do to affect one mic electrically when "Y"ed together affects how the 2nd one picks up too. When you strike one drum, BOTH mics will pick up the sound (one slightly delayed) and make for a slightly muddied sound with both mics sending the same sound down the cable through the mixer. Does this happen with multiple mics on their own mixer channels? Yes, but you can electrically alter each mic individually to improve the sound.