Retaining Walls: Only ON the border of Tiles and buildable like Pipes or…

Retaining Walls: Only ON the border of Tiles and buildable like Pipes or Conveyorbelts.

Ok to make this suggestion a little easier to understand.
1. Retainingwalls ONLY make sense if they are used to block a tile from spilling.
2. Retainingwalls are 2 wide regardless of length.
3. Tiles have a set grid.
It would make things a lot easier if you could place retaining walls on the border of tiles instead of before or after the border.
With this it does not matter which side of the wall you dig or fill in.
All you need to consider is the hight of the wall.
With this mechanic you could also easier make a double hight variant which is like 4 wide. We all are already used to missing one halve of a Tile after all.(More balanced that way. Double Hight double wide. Higher Tec. Higher Cost. You get the gist of it.)
It would also help if you could just place them like you would with conveyor belts or pipes.
Also if the placement is guided you don't have the issues players are facing right now.
I hope this description is sufficient as my allowed characters are running out. :DDDDDDD

Ah yes lets add a comment to this. If we are already on the topic of guided placement, Sloped retaining walls which go with the slope for vehicles would also make a great addition, especially estetically speaking.

If devs consider it, please don't force it, but make it an option, as I would like to be able to freely place retaining walls. (for example to make really steep walls.)

Place them like you would with conveyor belts or pipes. <== This one PLEASE :)