9-1-9 covers this positioning.
The rule specifically mentions the vertical edge of the space with the lane and the vertical edges of the sides of the space BUT DOES NOT MAKE ANY MENTION OF THE BACK OF THE SPACE.
For the front of the space there is obviously the lane line. For the sides of the space there are markers that can be visually extended to determine proper positioning. There is no mark for the back of the space.
References to the other three sides say "may not have either foot beyond the vertical plane..." I think that could reasonably be extended to include the back plane however you don't have a reference line for the back of the space.
Preventive officiating is likely the best approach. Ask the player to stay within three feet of the lane. You sure can't call a 3 foot 2 inch violation because you don't have a line allowing you to definitely say "you are beyond this point."
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"There are no superstar calls. We don't root for certain teams. We don't cheat. But sometimes we just miss calls." - Joe Crawford
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