spring loaded platform non-suspended turntable

There is no question that your SP10 would benefit from some kind of isolation. Minus K has the advantage that it is mechanical and does not need a compressor. However, as was mentioned earlier, the load need to be centered and the unit needs to be properly sized for the load.

Albert porter uses a Vibraplane under his SP10 MK3 to great effect. You may want to PM him. I also use a Vibraplane for my suspended SME 30/12. The key with Vibraplane is to preload it as it is most effective if operating near its max. design load. The improvement for both my SME 10 and 30/12 was dramatic.

You might want to consider getting a large enough surface on either device so that you can also put the motor controller up on isolation. That too matters.

There is a recent review in which the Minus K was directly compared to a Vibraplane, and the guy preferred the Minus K, FWIW. Whichever device you decide to use, the supporting rack must be very solid and stable.

Congratulations Crubio. I'm sure you will realize the benefit of isolation. On another forum I saw a photograph of the Rockport Sirius III. Interestingly, it sits on a custom stand designed for Rockport manufactured by Newport or TMC for their scientific lab air isolation stands/platforms. The Rockport turntable has the air isolation pistons on top of the stand just below the turntable plinth as opposed to at the bottom under the stand where the isolation would be further away from the turntable and be required to carry a much heavier load.

This design should deal more effectively with airborne vibrations hitting the stand which are thus isolated from the turntable. If the whole stand were sitting on isolation, airborne vibrations hitting the stand would make their way into the turntable.