I wouldn't hang a 36" on a single rafter tail. This bracket is too lightweight and also provides no lateral support. It would not provide adequate support and your dish would dance like a kite in the wind and ultimately damage or weaken the eave.
36" dishes have quite the wind load. I would have a two if not a three point mount when mounting under the eave. A rafter often needs additional blocking to add the necessary rigidity to support these larger dishes.