-Z or +Z ( - and + is the distance..)
for example if the floor of your tunnel is at -1,2 use -1,1 to spawn. ( dont wether it will conflict if you use -1.2 also)
Same counts for on a building, but use positive numbers.
Look in Zidane's last picture, Z:6,4 if you look closely. Open up the properties screen by clicking on the white text and look for the Z value. Shoudl be at the left side.
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