My guess is that you will get wildly different results with this pup on the Dobro, simply because it's designed not to vibrate in just about everywhere except for the spider/cone. Can't put it on the cone directly as it will mass-load the cone to death - literally. Sides of the dobro body should be relatively dead as well from a vibration standpoint.
Well a crazy experimenter like me would try cone attachment anyway. The amount of mass loading might be something that I could live with in order to amplify the thing, after all we're not talking a Dobro King here, we are talking the ability to do one Intro for one song. EQ in the amp would likely make up any difference there.
And if I couldn't easily place it on the cone, then I'd try something like clamping one to the bridge, or even perhaps placing a sheet of that piezo plastic between bridge and cone somewhere.
Heck, I'm crazy enough to try putting a miniature electret condenser element inside the Dobro, pointing at the cone. Attachment? A blob of RTV...
--Mac
Mac, I have done this on my Larrivée acoustic with one of those AT 'choir' mics that also came with a spring clip for lavalier-type use. My issue was that at the time I had no way to roll-off the lows that were overwhelming the mic in the sound-hole. Those little ATs were some of the most versatile mics (they still make many flavors of them) mainly because of the various mounts that came with them (spring-wire for hanging over a choir, plastic tube with threaded mount for use on a stand, and the lavalier clip for all kinds of sneaky uses!
My concern on mounting it right on the cone is that the mass is likely as much or more than the cone itself - but yes - experimentation would be fun!
Eddie, as I think about the past use of the little AT condensers, if you have one of those (not unlike this:
http://www.sweetwater.com/store/detail/Pro45 ) that also has a spring clip to use as a lavalier, there are plenty of places on a Dobro to clip one of these. You will likely need to significantly roll off the low end - I would do this as early in the analog signal chain as possible. Anyways, there are a few manufacturers of these types of mics, most of them terminate in a belt-pack connector rather than XLR.