Optimal IPv6 mode for TMO Home Internet with the Spitz

I am using T-Mobile Home Internet with the Spitz X-3000, what is the optimal configuration for IPv6? Assuming I have a router behind the Spitz already configured in Passthrough mode for IPv6, should the Spitz be configured in NAT6 mode?

I am connected to the T-Mobile Home Internet in the US, I replaced the T-Mobile Gateway with the Spitz X-3000, I want to configure IPv6 in the Spitz in the same way as it is already configured in the T-Mobile Gateway (Nokia, Arcadyan, Sagemcom), which IPv6 MODE in the Spitz is the right one? NATIVE, PASSTHROUGH, NAT6?

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The manual tells us:

NAT6 mode is suitable for scenarios where a router is used as a management gateway to assign dynamic internal IPv6 addresses to each device on the network. In this mode, terminal devices connect through a light cat and obtain a local area network IPv6 address.

Native mode is applicable when the router directly obtains a public IPv6 address, and the router automatically assigns IPv6 addresses to online devices. This mode can meet the IPv6 access needs of most users.

Static IPv6 mode is suitable for devices or services that require a fixed IPv6 address, such as servers or network printers. This mode ensures that the device always uses the same IPv6 address, facilitating management and access.

Passthrough mode is applicable when IPv6 packets need to be directly passed through without any processing or conversion. For example, some specific network applications or services may require the complete preservation of the content of IPv6 packets for further processing or analysis, which is used by technical personnel for network debugging or security analysis.

So I would say that Native is the one to go. In that case, your device will get an IPv6 subnet and every device will get a address from this subnet.