MMR is intended for high-traffic environments. Typically, these will be either large servers or hosting providers where pooling media resources is ideal. Smaller homeservers can use MMR as well, though they won't usually get the same benefits as larger deployments.
Small/individual server owners should consider using their homeserver's built-in media repo instead. Deploying MMR can be complicated, and support rooms will assume basic fundamental knowledge of reverse proxies and Matrix when diagnosing problems.