I’ve installed Screenly a couple of times now (once from your image, the other going from Lite and installing Screenly on top) to use as a home information display, but it seems incapable of the simplest of things.
I want to display some web pages from an internal network web server. The first issue is that it does not seem able to find local servers - I don’t think it is using my local DNS server.
Secondly, it is unable to use any sites that have parameters - replacing & with &amp; etc etc.
Screenly does look like the right product for what I want, but unfortunately it has some massive failures.
This is really going to put off your customers who may think about using the commercail product.