From an installer point of view, any direction is possible BUT it will really depend on your interior outlook and personal preference. The installation can be done lengthwise or width wise, no issues.
On a general rule of thumb, the most effective way is when you lay your flooring the same direction as the main light source and in the same alignment with your main entrance. But usually a house will have several rooms and different windows placement, base on the difference, you can adopt different direction that best suit the room.
HOW DO YOU CHOOSE WHICH IS THE PERFECT LAYING DIRECTION?
Laying your flooring in the same line with your entrance and main light source instantly brightens up your area!
Horizontally = Wider
Lay your boards width wise to make a narrow room look wider than it actually is.
Vertical = Longer
Installing vertical lengthwise add depth to a short room making it longish.
*All illustration images credit to QuickStep.
Diagonal = BIGGER
45-degree angle installation can instantly spruce up a small room to look more WOW.
Source of article: FloorXpert