We observe that different bath gases and deposition angles create different dynamical matrix surfaces, changing the conformer abundances of rotational isomers of CH3ONO compared to the gas phase. We conclude that a competition between energetic effects and surface morphological effects dictate changes in these abundances. Our results highlight the necessity for detailed characterization of conformer abundances in matrix-isolated systems. These results also emphasize the need for future experimental and theoretical studies of the dynamics of inert gas matrix deposition, including quantification of the effects of local energetic stabilization and enhanced surface trapping of rotational conformers. Analysis (equal); Funding Acquisition (lead); Project Administration (lead); Supervision (lead); Validation (equal); Writing/Review & Editing (equal).