Those clips are designed clip to the cabinet legs and are the only type commonly available, so you often run a plinth across the front of appliances clipped to legs at either end. Where that isn't possible, e.g where the washer is at the end of the run, I've often rigged something up with magnetic door catches, etc as I carry them in my bits and bobs box and they are widely available:
View attachment 261305
The door catch is screwed to the end panel, the metal plate is screwed to the back of the plinth. The other things I use are
Keku clips:
View attachment 261306 View attachment 261309
which are a mechanical clip and are fixed in the same way (left side piece in the picture to the inside of the end decor panel, other piece to the back of the plinth piece). They are used a lot in shop and bar fitting and public rest rooms where removeable access covers are needed.