A monitor with 1920x1080 resolution, 60Hz refresh rate and 24-bit color requires bandwidth of ~4.43Gb/s whereas DP 1.1a provides 10.8Gb/s, which is fine for two 1080p monitors. Unfortunately the HDMI outputs are limited to 1920x1080 which indicates that this adapter might be based on older, 1.1a or earlier, DisplayPort (DP) version. These adapters are first of their kind and simply have one (Mini) DisplayPort input and two HDMI outputs, which allows users to use one DisplayPort port for two HDMI equipped monitors. Assuming you wish to run macOS on your Mac computer then you will not get it working, or rather your chances are pretty slim.Zotac has released two new products: Mini DisplayPort and DisplayPort to dual HDMI adapters. So, yes, this is supported in Windows and if you boot your 2014 vintage Mac with Windows it would take only a MST DisplayPort to dual HDMI adapter to do as you wish. To get this working would involve some "hack" so there is no simple answer to your question other than it won't work.
Apple did not include support for MST in their OS or drivers. This is proven quite clearly with people booting Windows or Linux on their Apple computers and getting MST adapters and displays to work. The hardware in Apple computers is capable of supporting MST, so that's not stopping you.
Without any official support for this your chances of it working consistently for you are slim. I've come across people on the internet that claimed getting two displays from one port on Apple computers running macOS but it does seem quite clear that Apple does not support this function. There are video adapters from DisplayPort to two HDMI ports, and these would be supported by Windows and Linux but not on macOS.
Two displays from one DisplayPort connection requires "multi-stream transport", and Apple does not support this.
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