Hi I am in flooring The floor does not have to be water level you have a allowance of 3mm in 1mt or 6mm it 2mt or 9mm in 3mt get the picture The subfloor does have to be hard and smooth But you CAN NOT put the kitchen on the floating floor, the floating floor needs to be able to expand and contract with a min of 10 mm expansion or 1.5mm for every 1mt so a 10mt long room needs 15 mm expansion gap at ether end. Ask the kitchen supplier if he can leave the kick boards of a put them on are the floor is installed

R u laying boards over the concrete or beside?

I hope you get a more informed answer from someone but one thing I pictured was if one tile is flat and then there is the grout line and then there is another tile which is very slightly tilted in comparison to the first tile and then there's another grout line and another tile and so on, it might be imperceptible enough when walking over it but make a difference when laying long boards over it? Though the boards have an underlay which you'd think smooths out any tiny unevenness? Maybe the person we spoke to was just being super fussy. or maybe ensuring there's no problems halfway through the job? I'm not sure. At least you don't have the added dilemma of trying to make it work with the wet areas.

How likely there will be a ghosting when I try to get mechanical polish concrete floor which previously had tile on? How sure?