When we bought this house 12 years ago it came with a Beachcomber 6 person tub. My wife did not want it, so we later sold it off. I left all the wiring in place, just tucked under the deck (breaker removed from the panel at the time).
~3 years ago we did a backyard reno and my wife decided she did want a tub now. We bought a 6 person Jacuzzi locally.
I had a pad poured for the tub, but it is tilted more than I would have preferred. No real issue, other than the water level in the tub is around 1-1.5 inches "tilted".
I have seen tubs installed on gravel or even patio stones, so I know you don't NEED to do a pad specifically for your tub. I was having other concrete work done anyway, so added that pad to the project at the time. Our deck butts up against one side, so people can either use the steps that came with the tub on 1 side, or just go in off the deck on an adjacent side.
Been happy with it. I even use it more than I thought I would. Typically have to add chemicals 2x a week. Drain and refill 4 times a year. I run it all winter up here in Canada.
Here is a summer pic after the project completed.
