Outdoor electronic signage can be mounted in any position with the right hardware; however there are some points to take into account.
When setting up dynamic advertising outdoors you have to make certain that the mounting hardware is made to cope with the weather, for instance you would not want to use an inside bracket as this undoubtedly would not be weather proof and these are in general chrome plated that in time will discolor and require changing.
The weight of a typical 46" LCD screen is 60lbs, then the campaign player 3lb and not forgetting the 46" Outdoor LCD enclosure (that offers the waterproof protection) at 100lb plus the accessories such as cables, you are looking at a rough total of 165lbs now usual inside brackets (for domestic use) are only manufactured to take the display with no peripherals such as the media player and undoubtedly not an enclosure.
So the mounting equipment has to be heavy duty, these ranges that are manufactured for electronic marketing use offer a variety of cost effective mounting solutions for displays up to and including 60", these can be mounted for example as a lone screen in landscape or portrait or in a twin format (back to back).
In addition to the mounts the columns can be extended for numerous height environments, at 4" increments, the mounting plate for the protecting LCD housing can be angled from being flat to 18 degrees ensuring everyone can see the advertising material.
Cables are unseen in side the column in a cable raceway to make the deployment look neat. The units are made from steel and have a special coating that protects them from the tough climate in the open air and this stops them from corroding.
These ceiling mounts have been used in football and baseball stadiums and even at outdoor music festivals, so that viewers can see the action on the stage if they are too far away or in a place where they cannot see the stage.
Now there is a business who are developing a reclining mount for a unique deployment in Florida for 60" displays that will be located out-of-doors.