CUPID-Mo is a demonstrator experiment for CUPID, a proposed next generation ton-scale 0νββ search. CUPID-Mo, located in Laboratoire Souterrain de Modane, consists of an array of 20 ~0.2kg enriched Li$_2$$^{100}$Mo0$_4$ scintillating cryogenic calorimeters with 20 Ge wafer light detectors for alpha and beta/gamma particle discrimination. Whilst CUPID-Mo aims to have leading sensitivity for 0νββ to the ground state of Ru1, there is also the potential to measure 2(0)νββ to excited states by looking at coincidences with gamma de-excitations. An excellent energy resolution of 2 - 7 keV over the full spectral range, along with good radiopurity leads us to expect a significant potential for new results. Here, we present a study of the signal efficiency and the predicted background index for various event signatures using a detailed Geant4 MC simulation.