My tip is that instead of a Ethernet-bridge I use a a pair of dumb “USB to RJ45” converter-adapters which are passive-plugs that as a set can easily convert practically any CAT5e/CAT6 shielded Ethernet cable into a very long USB extension cable. See for example these USB extension solutions:
So as long as you can pull an Ethernet-cable from your computer running Home Assistant to the location you want to place this adapter then this can ”Ethernet-cable to USB-extension conversion can be a solution.
In my opinon I would argue that for my current setup this is actually a better solution than using an Ethernet PoE solution as this has less complexity and fewer things that can go wrong. I even have a powered USB 2.0 hub there for it in the middle of my house where the Z-Wave and Zigbee dongles connect to. Note though that 30 meters or 100 feet is the recommended maximum length if you want to use full-speed USB 2.0 data traffic over a such passive cable:
PS: There is by the way a lot more related tips here a most there also applies to Z-Wave as well: