My ferplast 120 & stand is on laminate/wooden flooring, it does move slighlty but mines kinda packed in to a corner near the tv and kids toys so it's only got inches to move.
They are quite sturdy, mines recently been in storage in my garage and I've pushed the cage & stand from the garage up my path in to the house without it seperating.
The cage sits on a little ledge on the stand, but in my opinion they are good x.