Specifically, there are no docks that have more than two 40Gbps TB3 ports. Some docks have additional USB-C ports that provide 10Gbps or 5Gbps ports that are usually called Thunderbolt ports. True TB3 ports will not work with enclosures that that do not fully support TB3 40Gbps speeds (even the cables are different.) There is a marketing distinction between TB3 and Thunderbolt even though both use the same USB-C connecters.
Docks, hubs, and enclosures that support the 40Gbps TB3 speed are considerably more expensive than those that do not. This cost differential range from three times up to 8 times more expensive. The lowest price I have paid for a 40Gbps TB3 enclosure was $125.00.
It's important in some cases to distinguish between Thunderbolt and Thunderbolt 3.