I found these as a cost effective solution to POE requirements, they work great for an AR300Mx for example. Should work with other models too. You can find numerous vendors for these on various web sites but here is an example to get you going.
48 volt Actiive POE:
https://www.amazon.co.uk/DSLRKIT-Active-Splitter-Ethernet-Raspberry/dp/B01H37XQP8