Although many reports on immobilization methods and studies investigating catalytic activity with hybrid systems for electrical and chemical transformations have been presented, problems still remain. The catalytic behavior of the molecular catalyst does not transcribe unchangeably to the immobilized state. Discussions on the effects of linkages of different types and lengths involved in heterogenization and what linkage/immobilization to choose are still ongoing. In some cases, the linkage is not expected to be as contributory and influential as in other circumstances when all other system components are evaluated. In another scenario, for example, the strong conjugation between the electrode and the catalyst is key to the system's uniqueness. Implementing functional groups on a ligand either exerts a positive or negative impact on the reactivity, and requires a comprehensive understanding of the inductive and electrostatic effects for structure optimization. Fundamental studies of the electrode/electrolyte interface, electron transfer kinetics, and electron-proton coupled/decoupled pathways need to be conducted. Although less elaborated in this review, we would like to emphasize the importance of the bulk environment in which reactions occur. Solvent and electrolyte, for example, could decide on the reaction pathway and certainly need to be included in the design.