Shovel of Obstacles is a Magic Item introduced on the Winter Update of 2018 that has the ability to move any obstacle on your village, including special ones (Christmas trees and Gem Box).
You can also to move special obstacles located at the borders of your village, making this a very special tool.
With the Shovel of Obstacles you will finally be able to fix the position of the special obstacles that spawned at the wrong place.
The expected cost is 500 gems at the Shop, but the Shovel of Obstacles made its debut costing real money. Two packages were made available on the Christmas of 2018, one including a special obstacle, the Snowman.
The Shovel of Obstacles is a great tool but not really necessary. You don't need to spend gems or money to get the obstacles on the place you want.
To force the obstacles to spawn at the border all you have to do is a base without any 2x2 empty space. The obstacles requires a 2x2 space to spawn. If there isn't any room available, it will be forced to spawn at the border.