Most signage vendors ship a smart TV digital signage app: a Tizen app for Samsung, a webOS app for LG, an APK for Android TV, each installed and updated set by set, and each slightly different. Displayer's player is a web page, so the same player runs on every brand that has a working browser. There is nothing to sideload, no developer mode to switch on and no app version to keep in step across a mixed estate. When the player improves, every TV gets it the next time it loads.
The trade is honest: a native app can sometimes start faster on power on and lock the set more tightly. If a particular TV's browser is slow or will not auto start, a small Android or Chrome device behind the panel pairs in exactly the same way and costs less than one site visit.