Place the following line in the "Initialisation field" of the object you created
this setpos [getpos this select 0, getpos this select 1,X]
X can be a negative or positive number
A Negative number , eg. -3, will sink the object into the ground
A positive number eg 3 will raise the object of the ground
A number to adecimal point, eg 2.3 can be used to get more accurate placement
To get the exact height and location is a matter of trial and error