On iPad Pro 2021 12.9, it doesn't fit very well on a magnetic case, you need to remove the case first and then put it back on, however, there is a small gap on the back of the iPad. It still doesn't "stick" to the iPad, it has a little bit of air. I think it's better to prefer a hub with a cable instead of this type of hub.

I use it on iPad PRO 2020 and Samsung S20fe to connect to the TV via HDMI input.

All four ports work perfectly.
The usb-c port is also used for charging the devices.
The usb-A is not 3.0, it is 2.0 (a bit slower).

Attention: Make sure it fits with the case you are using.

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Fast usb hub fits perfectly on the iPad Pro 2018, I have it for 9 months now and I use it daily. It may only have one usb port but it is fast. I also recommend it for users who want to connect an external hard drive to the iPad.