You can use system:compare values
object = the object that you drag and drop
target = the position in which you want the object to stick
value is determined by how big you want the snap to be
On dropped "object" |
system: compare values: abs("object".x - "target".x) < "value" |
system: compare values: abs("object".y - "target".y) < "value" |set position of "object" to "target".x and "target".y