This could be a solution too:
https://www.amazon.de/gp/product/B073P7J1KR/ref=ox_sc_act_title_1?smid=A17E6NHH69EC1B&psc=1 if a POE Switch already existing in your env.
in combination with https://www.amazon.de/Goobay-95749-SuperSpeed-Y-USB-Kabel-externe/dp/B00H2JKHVY/ref=sr_1_1?ie=UTF8&qid=1508145573&sr=8-1&keywords=USB+Dual+Power