I'll say it again, there are yards that know what they are doing in blocking a boat for hurricanes, and those who do the bare minimum, and everything in between. Caveat emptor. At least around these parts, you are way safer up in a good yard than in the water. A yard that can't take a 6 foot surge? Yikes! Not to mention, it has to be protected from the major wind directions that hurricanes throw at you.
We had a ski boat that sank in our driveway, on it's trailer, in Katrina. I had the plug in, and had tied it to the trailer, and had lines to trees in our yard, where it could float up, and back down, planning on a ten foot storm surge at worst.
Unfortunately, we got twenty three feet, and I'm pretty sure the lines I tied it off with, pulled it under.