50 amp socket is nice for a welder or car charger. Put it so a welder cord can easily go through door and get plugged in. Only weld outside to avoid problems with sparks and fumes. If nothing else rum empty conduit form inside outlet to future outside ones location.
Make sure welder outlet is wired for true 50 amp service so it can be used for a car charger. A stick welder 50 amp outlet is really only wired for 40 amps. A car charger will overload the wiring.
Bill D