I'm waiting delivery of a 2x2m 5 person hot tub. 370kg without water, roughly 1650kg with, adding 5 people at average 75kg makes it just over 2 metric tonnes. I want a floating base (if possible) to sit on an existing paved patio which as you would imagine is not level enough for a hot tub. Should I create a concrete base, or could I use standard deck build and use risers to level? Any advice gratefully received!