Some of the Lenovo tiny 1L machines can take a PCI card to add more ports. I've specifically seen it done with the 720q. You'll need a riser for it to fit. If you search on AliExpress for "lenovo thinkcentre tiny network riser card" or similar you'll find some examples.
There are several threads about this on Reddit, but I'm not going to link them because of all the mess going on over there. If you search a bit you'll find them though. If they've been deleted due to the protests, try a cached copy on Google.