Is there a USB-C PoE adapter for iPad Pro? Is there a dongle which plugs into the USB-C port on the iPad Pro that accepts Power over Ethernet (PoE) so when PoE is available there’s no need to plug an additional USB-C cable to provide power to the device?

I see that starting this year Apple is selling a Belkin adapter for the lightning port which provides this, but I don't see any offerings for USB-C

I'm looking for an always-on kiosk implementation where Ethernet is preferred and more robust than Wi-Fi.
You could use something like this to turn 802.3at POE+ into data and USB-C power, then use a short USB-C cable and a short CAT6 cable to immediately patch into one of these (haven't personally tested this adapter but it should work in theory).  Not ideal since it requires multiple adapters, but a workable solution.