ARK: Survival Evolved
Place one and take a wall but dont place it. If the wall hologram is green then you are looking at the outside of the wall. If its blue then the side facing you is the inside (wood plank). Do not press the rotation key (triangle) that would make your wall look ugly. If its wrong then destroy the fence foundation and replace it. Its ok to rotate the fence foundation. Rotate a few times to see it go in and out the other fence foundation. That way you can see the right one (out, just touching).
If you would place them normally the can be out of line, luckily they snap. Where you would normally place the gate, move over slightly towards the previous gate and you see that the outline of the gate suddenly snappes into place. Handy for a straight wall but you can snap it into 8 angles (45° and so). Its easy to follow the terrain and go around hills and valleys and enclose the gates around your base. To get the other angles just snap and move your (gun) crossair slightly up down left right to get the other snap point.
How do you snap fence foundations in Ark?
How do fence supports work ark?
How do you make a fence on uneven ground in Ark?
How do I build a foundation fence?