A flatbed is still a flatbed even if sold by a company previously known for drum scanners. If your scanner has a CCD it is a flatbed, no matter whether it is cleverly shaped to stand upright and hence mascarade as a drum scanner. If your scanner has a PMT system, then it is a drum scanner, no matter what size or shape it is. Drum scanners require technicians to keep them calibrated. If you inside on a used scanner try this place, but we do not have experience, we just saw their stand at a trade show.
Centrifugal force holds the originals firmly and evenly against the drum surface.
If this means no mounting goo, I am all for recommending this manner of scanning. Callisto 308I, Mac software. They finally went out of business, small wonder if they couldn't even keep their web site open to the public. We review their mid-range Saphir Ultra2 flatbed scanner Kodak, Ektaplus Image Drum. Kodak has not fared well in the digital era.