The principal problem with any adhesive is, it binds just to what is on the surface, most likely a wall paint. So even when that bond could hold a tank, it becomes useles when the top layer is not attached to the main material. And definitely paint uses to have just enough strength to hold just itself, so definitely nothing beyond some paper photo.
Plus the drywall material itself won't be able to hold it either.
So really you have to screw it into the wooden studs or use some stand (so do not hang it to the ceiling).