Depends on if you want the sound of the snares. I usually do.
Close micing the TOP of the snare frequently sounds like popcorn. Most of your snare sound is in the overheads and turning up the top of the snare track just brings it out more. Turn it up too much, though, and you lose the sound and just get that THUNK of the close mic.
Close mic the bottom, though, and you get the sound of the snares. Start turning that up and suddenly the snare pops out in the mix. A little goes a long way. Be careful compressing it, too. Because the snares have a lot more decay than the beater head mic compression can increase the sustain of the snares and sound odd. As always, you just have to get the settings right and I've found that with micing the bottom it really pays to get the sound you want with mic placement.
Watch out for bleed from the kick beater. And the snares resonating with tom hits.
-C