If you have a false ceiling you can use Ceiling mounted cassette system.
If you have hard ceiling but still want a unit on the ceiling you can use an under ceiling air conditioning unit.
If you prefer you can have a wall mounted air conditioning system. This is the most common type of installation you will see around.
If you don't like any of the options above you can use a floor standing air conditioning unit that is permanents mounted on the floor in your premises.