Is it possible to get rasplex to start a slideshow on boot?

I’m trying to set up a “digital picture frame” using a 24" monitor and RasPlex to show the (overly large) collection of family photos. (I’d tried to use Chromecast to show it, but the slideshow always timed out after a couple of hours.)

So far, I’ve gotten RasPlex started up, but I was wondering if there was some way (as Kodi does) to have it automatically start a slideshow on boot/startup.