Wind Ladders would have to be separated by a distance at least equal to twice their height. A mile-high version would be two miles from its neighbor, just in case they both decide to lean over towards each other, so they won't touch. This could happen due to high variable winds or catastrophic loss of inflation. If a tether snapped it's possible the entire wind ladder would be carried downwind and become entwined with every other wind ladder in its path before it could activate its emergency deflation ripcords. However, the "ladder" that I envisioned would have two vertical tethers on either side of the inflatable turbines, which would have their axes horizontal between the two tethers. A good engineer would design each tether to be strong enough to anchor the entire wind ladder. The second tether would be both functional and a redundant anchor in case the other failed. If one failed the other should ensure adequate margin to deflate all the units and salvage them without interfering with any neighboring wind ladders downwind.

If there were a hurricane, or a tornado, I really have no answer. Reel them in and secure them somehow? There may be plenty of areas where there are strong steady winds but no hurricanes.