Board Thread:Questions and Answers/@comment-13413401-20130913025528/@comment-3075738-20130913030811

Cows are (a bit) less than one block tall.

If by placing it at their feet, you probably mean that the block they stand on.

All three pages say that the projected areas are in front of the devices.

If my understanding is correct, the device should be centered on the fence or wall area facing the 5x5 roam area; on the level that their bodies are at.