Here is a good video on scale-able tiling with “TextureCoordinate” node: Unreal Engine 4 Tutorial - Scale Textures - YouTube
Or, try the “BrickAndTileUVs” node and set variables with “scalar parameter” nodes in the material’s blueprint… seems like it is designed to do tiling as a baked feature in UE4.17
See blueprint example in this thread: https://forums.unrealengine.com/development-discussion/rendering/104244-how-to-make-a-ceramic-tile-floor-material?p=892751#post892751