I bought Pluggable Active DisplayPort to HDMI adapters (https://www.amazon.com/Plugable-DisplayPort-Supports-displays-3840x2160/dp/B00S0C7QO8), and connected two monitors to them along with an HDMI into the HDMI port in my RX 570, but it will still only show on two monitors (any two).
I'm guessing these adapters are not active like they need to be, or there is some incompatibility. Can anyone provide a list of active DP to HDMI adapters that are known to work?