Which fast mac mini hub with NVME ssd for mac mini m2 16 GB 512 GB

If you want the maximum speed from the NVME drive it should be installed in a TB enclosure connected to one of the TB ports on the mini. Then you can get a less expensive hub if you want to add some additional USB ports.

Satechi has a hub that will let you install an NvME SSD internally, and from what I've heard is pretty fast. This hub sits under the bottom of the Mac mini and has the same aesthetic as the Mac mini so looks very pleasing as well. Can be found at Amazon by doing a search.

FWIW, depending on what you will be using the external drive for, spending the extra money on a Thunderbolt enclosure may not be a wise use of your money. If its purpose is only for external data storage, music libraries or video libraries, some of the latest USB-C enclosures will be more than fast enough for these purposes.

I have a Sabrent USB-C enclosure that supports USB 3.2 with a Samsung PRO 980 that is more than fast enough to supply the above mentioned needs and the enclosure was a 1/4 of the cost of a Thunderbolt or USB4 enclosure.

Sabrent USB-C enclosure

I have several. I like the Acasis best but also the Trebleet enclosure is rock solid. Here is one:

https://www.amazon.com/dp/B0C8CZB5S7/ref=dp_iou_view_item?ie=UTF8&th=1

I agree with @Tbirdvet that you should go with a separate enclosure for the drive.

While having it inside a hub package may seem convenient at first, if for what ever reason you may want to gain access to the drive, it would mean tearing down a whole setup in most cases. In a separate enclosure you just unplug the drive and do what you need to do leaving the rest of your setup intact.