My 1967 landlord's Frigi wasn't on concrete, it was on the flimsy wooden underhouse of a hillside Hawaii home. And it didn't cause anyone palpitations or earthquakes. I lived UNDER it and I couldn't tell when it stopped without walking upstairs to see. When I wasn't standing there watching it.
But it wasn't the magnificent 'control tower' machine. Those are dramatically understated, or understatedly dramatic. A pinnacle among good-old Merikun laundry design. What beauties.