I use a floro leader ALL the time on my rigger rods. We run McCoy Mean Green Mono and their floro. It's great stuff, but not cheap! There are a ton of great floros out there. Gamma had a good one, Seguar is great as well as Andy, and Berkley 100% floro. Just don't use the Berkley Vanish! We run 15lb leaders when running spoons and 20lb leaders when running paddles. On our rigger rods I bring the leader knot to right above the levelwind and then cut the line at the hook keeper. Reason I do this is because it gives you a 15' leader give or take a foot, and when the fleas do show up the gob of fleas that find the knot wont give you trouble trying to reel it through the levelwind when fighting a fish.
Hope that helps.