Protank and EVOD are clearomizers where the heating coil is submerged in the tank of juice. They have little silica wicks that wick the juice from the tank to the heating coil where it is vaporized, and you inhale it.
A dripping atomizer is a metal tube with a heating coil at the bottom of it. Some of them are surrounded with metal wool to hold liquid. You drip a few drops on the atomizer down the tube, put a mouthpiece on the end and vape it.
So as the Protank and EVOD are bottom coil devices, and the coil is submerged in the tank, I suppose you can remove the coil from the base, drip a few drops directly on the wicks and coil, screw it back in the tank, screw on your battery and vape it - but first, what a lot of hassle and second, you are asking for flooding / dry hit issues.
Just get a 510 dripping atty - trust me, it'll be a much, much better and more pleasant experience.