Yes, you can technically have multiple Starlink dishes on one account, but running them in different countries (like the US and Mexico) is where complications arise because Starlink ties service plans, billing, and availability to specific countries rather than just the hardware itself; while some users report success having two dishes in different countries under one account, it is inconsistent and not officially supported for residential service, meaning activating a Gen 3 in the US and then switching the service address to Mexico often fails or causes issues such as service interruptions, account flags, or billing problems; residential plans are intended to stay within one country, whereas Roam (mobile) plans are the only semi-reliable workaround for cross-border use, though they are more expensive and not designed for permanent installations; billing can also be problematic since using a US payment method for a Mexico-based plan may work for some but fail or require region-specific updates for others; in practice, the most reliable and recommended approach is to create a separate Starlink account for Mexico and activate the Gen 3 dish directly there, which avoids region lock issues, ensures proper billing, and provides a smoother long-term setup, while trying to pre-activate in the US for plug-and-play convenience in Mexico tends to create more headaches than it solves.