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Heat sink for LT3094/DC2624 without degrading the PSRR performance


I would like to use LT3094/LT3045-1 for positive and negative power supply. The output voltage is +- 12V but the input may be +-15V or +-18V. We are considering putting a heat sink beneath the LDOs (i.e., on the 4th layer).

But the reference designs of LT3094 and LT3045-1 suggest that a C1 being placed underneath for EMF current flow, which maximize the PSRR performance. Though, this capacitor make placing the heat sink non-feasible.

We would like to known, if we were maintaining the PSRR performance, where should we place this capacitor and why?

C1 makes placing heat sink non-feasible