Doesn't hurt to try. I have not seen many pro studios do this, but if it's for home recording or jamming out to why not.. If I was recording an album the POSSIBILITY of vibrations would be enough to stop me. For gigs, jamming, Youtube etc I wouldn't be as concerned. 2 boom stands don't that up all that much room and you have more options for placement personally.

Vibrations will travel up the stand and into the shockmount a bit. You may not hear it in playback but it will happen. At the end of the day if conveninence is what you're after I'd say go for it. There are no "rules" in drumming.