U2520D, S2718D, daisy chaining?

@Cain94  Daisy chaining relies on a technology called DisplayPort MST, which requires native DisplayPort signaling along the entire chain.  One possible workaround that would only be possible for the last display in the chain would be to use a DisplayPort to HDMI active adapter, like this one.  The much more common passive DP to HDMI adapters and cables rely on the DisplayPort source port supporting "Dual Mode DisplayPort", which is the ability to fall back to HDMI signaling.  That isn't an option in a daisy chain.  (And to my knowledge Dual Mode DisplayPort only ever supported up to 1920x1200 even if the DisplayPort source would support higher resolutions when using native DisplayPort.)  By comparison, active adapters incorporate an actual signal converter chip, which allows the source to continue sending a native DisplayPort signal since the adapter is switching to HDMI.  These adapters exist mostly to be used with DisplayPort sources that don't support Dual Mode DisplayPort and/or in use cases where using Dual Mode DP isn't allowed, such as AMD EyeFinity setups.  And since you'd be using this only for the last display in the chain, nothing else anywhere would be affected by or even aware of this "last hop" conversion occurring.  To be clear, I have not actually tested this, but I would expect it to work based on my understanding of the underlying technologies.

The other option would be to get an actual DisplayPort MST hub, which is how you can take advantage of DisplayPort MST's ability to run multiple independent displays from a single output even when your display's don't have DisplayPort outputs, but those are more expensive.

@jphughan Thanks I'll definitely give this a shot!

@Cain94 Cool!  Please do report back as to whether it works, because I'm curious now.   And just fyi, there are other active DisplayPort to HDMI adapters if that particular product isn't available where you are.  I just linked that one because Plugable has a strong reputation for quality products.  But if you do decide to shop other options, be careful about the type of active adapter you get.  The more common active adapter is designed to convert a DisplayPort source signal to HDMI, which is what you're trying to do.  But there are ALSO some active HDMI to DisplayPort adapters that are designed to convert an HDMI source signal to DisplayPort, which would not work for what you're doing.  Both types of adapters only work in one direction.  Good luck!