As the maximum element voltage is given as 200V I'd suggest to use two resistors in series. 115k is not part of the E12 series, so I'd switch to 120k instead. From a power dissipation point of view you'll have (230V^2*2)/240k=~311mW, so per resistor you'll have appx. 160mW what's okay for the 1206 form factor.