The following principles should be considered when setting the tower crane: 1, and the coverage of the boom should be considered.
2. Considering the convenience of installation and construction.
3. It is convenient to dismantle the tower (it is often not considered to dismantle the tower, and finally the tower crane can't be dismantled by itself, so it can only be dismantled in the air by renting a big crane).
It is possible to avoid hanging on the mountain. As long as the above conditions can be met, several buildings can use the same tower crane, or several tower cranes can be used in the same building.