Yes, that's it OG. What I should have added was.......... since it's a new installation, then the units could easily be fitted with the legs wound up to give extra clearance.
Roughly speaking - setting the worktop height at say, 915mm instead of 900mm.
Then tiling could be done after fitting units, and there would be clearance.
I can guarantee that, somewhere down the line, alterations may be needed. With a whole floor tiled, there won't be any patching up to do.... and discovering the tiles are no longer available.
Not a huge point. Just good practice, that's all.