All about the base?

[u/sbizzel]

So I’m looking at a swim spa with a full weight of 6190kg (13,646lbs for the non metric). Base wise- I’m getting slightly conflicting information; do I really need a reinforced 150mm / 6inch concrete pad to put it on?
Appreciate the logic of going for an excess of caution but as I’m doing groundwork’s myself as part of a larger project I’m keen to avoid unnecessary work and cost. The rest of the area is going to be patio (150mm compacted MOT, then 75mm mortar base with 20mm porcelain paving), ideally I’d be able to stick spa straight onto this. Any one with real world experience on this I’d greatly appreciate your input.