Either IsoBalls or Big Tall Tenderfoot isolation feet should do very well. We have lots of customers using both under Pro-Ject turntables, with each option giving excellent results.
Extra-Thick grungebuster sheet material should do very well as an isolation/decoupling interface between chassis and base. If using grungebuster Dots or sheet material between chassis and base, you would want to use Tenderfeet between base and shelf, or vice-versa. (Four Tenderfeet will usually give an audibly better result than three.)
Herbie's Audio Lab