I get them all the time on 1/8 oz Rooster Tails, in tanks, creeks, and reservoirs. More commonly along the rip rap in reservoirs.

In-line spinners are ideal, IMHO, for open water in a very short period before prespawn when sunfish and crappie move from deeper haunts to just outside prime spawn sites and they tend to be great all Summer and early Fall. It's been my experience that they work best as search lures in open water, or if around cover, chunk rock, boulders and riprap. Around grass, other veg and wood, you're better off with a jig/spinner combo or an elbow spinnerbait. Panfish elbow spinners like Booyah makes are super weedless so you can stop and drop them into holes and pockets of weed beds and you can weave them thru brush like nobody's business. If they bite a spinnerbait, they should be fairly active. Once you find a good concentration, pick them off with a jig/plastic combo. Preferably from the outside in.