Here is something interesting! Retailers always have a weird feeling about the area where the base shelf touches the floor. Technically, we are speaking of a vertical panel that stays in front of the base and works a finishing "fascia".
Caem's Tn9 and T25 systems features a kicker panel, that likewise a back panel does hang on the base and delivers a straight coloured fascia below the base shelf.
The problem is: when the floor of the store is not even, the eye will catch a dark line below the kicker panel not a straight shadow line, but as a wave that goes higher and lower when the floor goes lower and higher but the shelving stays correctly levelled. The problems is greater the longer the shelving run is.
Caem solution adopted in the newest S50 and M25 systems is a 'DROP PLATE' that sits on the floor. The drop plate is easy to install, easy to remove for maintainance and cleaning and gives the solutions to those problems of an 'un-even shadow line'. One may argue that the gap between the base shelf and the drop plate will not be regular... this is not a problem since this gap stays near - under the base shelf, so remains invisible.
Attached are pictures from M25 system.