the fitter with karndean is most important it has to be done properley, ive tried to find some old photos of my old house but no luck yet. admittedley i lived alone so not exactly high traffic but all i did was use karndeans cleaning products and a hoover. once ever 3 months mop the cleaner after hoovering and then apply the sealer all with a standard mop.
its important the floor is dry and flat, even though mine was a new build we had to use a dehumidifier to get it dry enough and a levelling compound in places as the variations exceeded the minimums.
but even in the bathroom and ensuite not a single tile moved or degraded even after a flooding when i forgot i was running a bath.
i put felt pads on the bottom of any furniture which helped prevent any marking or scratching.
the installer was excellant even did a border effect around each room. they used a contact adhesive and went over the whole thing with something that looked like a cricket pitch roller i am convinced thats what it was in a former life it looked like solid concrete with a felt cover. as i say it worked as nothing moved.