I found this great video of a roboworm rigged on a dropshot. It always helps to be able to visualize your bait in the water. This should really help with that.
I started using Robo Worms for the first time last year. They have since become a real go to bait for me. The 4.5 inch like the one shown here was responsible for taking many smallmouth for me last week. The 6 and 7 inch work great on a shakey head. Enjoy!