Don’t have any of our old research photos handy but those cradles got used anywhere from meat processing plants to hospitals so they would see liquid etc pretty frequently.
Another consideration is can the connector be “hidden” behind some kind of sealing door that can spring open when connected and pop closed when you pull the top out. That would prevent errant margarita from making direct contact with the pogos - liquid could drip down the sides of a chamber and out of the unit.
If they are being difficult about the movement of a pogo consider the blade connector. It requires better mechanical alignment which could be problematic but the connectors are self wiping by nature so even if there was goo the sharp edge would clean a clear contact.
How much voltage do you need to move? That will also play into how rugged it can be. If you need to send 110V for some giant heating coil vs 5v for some LED’s the solution might look different.