When I teach PvP classes, I teach people how to make good safespots. One of the things I mention for high-sec wardecs is to look at where your missions take you, because they're often in a random direction at a random distance from any celestial.
The same, only moreso, for Sansha incursions. Some of the sites are in the middle of freakin' nowhere, way off the plane of the ecliptic and well outside the 14.4 AU scanning range of directional. I just passed through an incursion system and on a whim, warped to one of the starter sites. It put me well above the plane of every celestial in the system, and 29.6 AU from the closest object: a perfect safespot.
If your home system or your favorite hunting ground gets an incursion, take the opportunity to pick up a few really good safespots from the sites!