Can you stack SMD resistors in parallel to reduce power dissipation per resistor?
I've seen stacked SMT resistors as a method for correcting resistor value.  But I haven't yet seen it as a method for increasing power rating.

Two (2) stacked resistors could indeed dissipate more heat than just one (1).  But the convective heat transfer from the bottom resistor will be hindered by the upper resistor, so the power rating of the stack would be less than 2x individual \$P_{stack of 2} &lt; 2P_{individual}\$ .

Your desired power rating is 350mW.  Nominally, you would need 3x 125mW resistors.  You may have to use a larger number of resistors.

Is this a one-off or production?  If it's production, consider changing the board.