Rotating Android bootup screen

I have a Nexus 7 (2nd generation) on Android 6.0. I am able to rotate and fix the screen on landscape using adb shell content. I am also able to adjust screen dimensions and resolution using adb shell wm. Now, the only thing I need to really do is figure out a way to rotate the entire device to actually be permanently in landscape mode so that when it reboots the Android logo and everything is in landscape. Is there any way to do this? My device is rooted already if that helps.