I love Roku; I currently own a house mostly run on Roku, but for DisplayHUB it's not the best option. There is a DisplayHUB app for Roku, and it works really well; however, Rokus cannot play the low-latency mode of DisplayHUB. The hardware at the OS level simply will not support it; that's why there is not a mode selection in the controller to enable the low latency mode. This is not a matter of writing a better app or trying a different protocol; Rokus only support DASH/HLS which both fundamentally have much more latency. Currently we can get that down to around 3 seconds if you really push the encoder(s), but it's typically not worth the effort, and the Rokus also have sync issues; again, we can get that down to as little .500 - 2 seconds between devices, and if you really work it, you might even get perfect sync, but the devices have to react to the play commands in different ways. Most people do not notice the sync issues unless the displays are side-by-side, and latency is also not noticeable unless you place a DisplayHUB output next to a live output.
Do you need perfect sync and low latency? Then Roku devices are not for your install.
Already have Roku TVs but want better sync and low latency? simply add a Fire TV stick (or Android).
Roku devices do work with DisplayHUB, just have the expectation they will not be in perfect sync and they will not be low latency.
