You'll definitely want spring clamps. I watch my friends with RUFs and no clamps have their springs slap slap slap all the time. It allows a ton of axle wrap. One so much that he broke a u-joint at the diff side because it was so bound up.
I would put it on the 3rd of 4th leaf. It still allows good droop, but keeps the "main" leaves together a little better. Just my experience. In fact, I have a spring clamp on both sides, but you want to make sure you have at least a spring clamp on the shackle side. That is the side that it will wrap and unload.
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