Is there any way to create binding nodes

Basically, I am making a simple building game, where player is presented with a pre existing base structure(later - base). When a player presses a button on gui to add a sertain component (later - block) to the building , a new object is being created that is then needed to snap to the base. It means that the block can only be plased at certain points around the base and in certain rotation. Each block can also be snapped to another blocks existing in the scene. It should work kinda like snapping in fallout 4, but with a mouse pointer) If anyone knows a possible way to do this, please tell me, I'd appreciate any help.)