Take a look at the Advan Netvanta 1531P. It's a 12 port switch with 8 ports POE and it is fanless. Beyond that go with a multi port POE injector like this:
https://www.amazon.com/WS-POE-24-48v120w-24-Port-Poe-Injector/dp/B01BI2Y5SG/ref=sr_1_5?ie=UTF8&qid=1540138856&sr=8-5&keywords=12+port+poe+injector