Which arm mount are would you use for an imac pro + an LG ultrafine 5K screen ? 2 FLO PLUS from Colebrook bosson saunders (https://www.colebrookbossonsaunders.com/fr/monitor-arms/flo/dual/) seems fine but i was looking into smth black or "space grey". Also would you use 2 arms or one dual? Any link is welcome.