This is what I have in my DefautEngine.ini
[Daydream.Splash.Settings]
TexturePath=/Game/UI/SplashScreens/Daydream/T_SplashScreen-Temp
TextureUVOffset=(X=0.0, Y=0.0)
TextureUVSize=(X=1.0, Y=1.0)
RenderDistanceInMeter=2.0
As said above, when hooked up to a PC the logs told me that it was loading it correctly. I had to turn off Mobile Multi-View to actually see it though.
For my project, RenderDistanceInMeter of 2.0 was far enough away to see it without it being super close (if I can ever get my project running again, I may try just a bit farther away).
Hopefully I can get my project building again so I can confirm the Splash Screen still works…