It's rare to see a prop cage on a sailboat in Maine, but you can find them. Most of the lobster boats use them(that should tell you something).

Here's a prop cage with a spade rudder.
At high water and with a sea running, the buoys can be a few-several feet under water. Invisible.
Here's a toggle buoy set up at high water. The main buoy is nearly invisible - underwater and up-current of the toggle. Some boats (underbody) are stickier than others when it comes to pots and warp. Older boats with long keels and attached rudders, have an advantage with lobster buoys. Our boat is slippery to pot warp, even under power.
Still, sailing is the best deterrent to problems. If you get hung up under sail, it's usually just a matter of tacking to get free, even with modern underbodies. With a spinning prop, it's a different story.
Some days sailing in the more tightly choked areas of our coast, I lose track of all the buoys we run down. You can hear the buoys clunking along the bottom of the boat. A glance back to see them pop up, and you're all set.