I've had good luck with a Thunderbolt 4 Hub from Anker as of late. The hub has a power button of its own, and when the hub is turned off it turns off the attach

I've had good luck with a Thunderbolt 4 Hub from Anker as of late. The hub has a power button of its own, and when the hub is turned off it turns off the attached USB-C-to-Ethernet adapter.