This is a standard between the wall adapter, cables, and hardware requiring the power (i.e., Steam Deck).
You could use a 10000000 Watt capable adapter, but through negotiation the Steam Deck will only ever ask for 45 Watts maximum. I personally have a 100 Watt capable adapter and can verify both on the Steam Deck and with a passthru digital meter that tells me what is being drawn.
So to simply answer your question - literally any Dock, so long as it touts having USB-C PD.
First and foremost, the Steam Deck uses USB-C PD (USBC Power Delivery).
This is a standard between the wall adapter, cables, and hardware requiring the power (i.e., Steam Deck).
You could use a 10000000 Watt capable adapter, but through negotiation the Steam Deck will only ever ask for 45 Watts maximum. I personally have a 100 Watt capable adapter and can verify both on the Steam Deck and with a passthru digital meter that tells me what is being drawn.
So to simply answer your question - literally any Dock, so long as it touts having USB-C PD.