Avoid 90 degree interior corners where a lower horse can be trapped by a higher horse.
Don’t put food and water where a lower horse can’t yield to a higher horse without getting kicked.
Install gates large enough for vehicle access (usually 12 ft).
The dynamics of a family unit are different from a group of randomly chosen horses.
If you place, say three unrelated horses in a corral (e.g., mare and two geldings), you will likely see more pushing and establishment of pecking order. (Do not be fooled however, they will form a cohesive group. Some call this ‘buddy sour.’ Use it to your advantage: Learn how to become his best buddy.)
If you adopt a family unit (mare and one or more foals) you may wonder about hierarchy: These guys will eat together on one pile of hay, no pushing.