The report states 'mixing' - thus the term 'shaker' is a bit misleading.
A shaker has one major disadvantage: if you have a material with differing particle sizes, a vertical shaker tends to 'sort' the particles in the way that the finest particles are at the botton, the largest on top of the 'mix'. This is at least true for "moderate" shaking.
The 'mixers' I know of are all of the rotational type - whether vertical or horizontal. Either you have some type of 'stirrer' rotating in a stationary 'drum' (realizable in vertical or horizontal designs), or you have a drum with fins at the inner surface that act - assisted by gravity - as a kind of stirrer (horizontal designs).
Both designs have their advantages and drawbacks. The materials to be mixed dictate the design: abrasive components are handled better in the fin design, as there is no relative movement of a stirrer vs. the drum, while non-abrasive components are easily handled by the stirrer designs.