To install the mod, you need to copy the files to the folder "C:\Users\{USER_NAME}\AppData\Roaming\Factorio\mods" or use the special FMM program (factorio mod manager). If a mod is missing from the requirements, please let us know in the comments.
Modifies underground belts and pipes to show their max range when placing them. There's an option to show the indicator when hovering over built entities as well, not only when placing.