1: Ctrl+Shift click on the textbox and enter in the value. Ctrl+shift allows you to enter in higher values then normally. [Actually, this works for #2 as well.]
This might cause unwanted consequences because you are completely removing the buildings pathing and thus units can walk right over it. Go into the object editor and go to pathing. Go to the top and click on NONE. Then your building will have no pathing and (should) be placable anywhere.