For automation purposes I hacked my local binary to allow to run SnakeTail maximized and with vertical tiling of tabs. I think these might be useful for others too, possibly extended and/or cleaned up ;)

I changed MainForm.MainForm_Shown to have these additional branches for command line parsing:

else if (commandLineArgs[i] == "-maximize")
{
	base.WindowState = FormWindowState.Maximized;
}
else if (commandLineArgs[i] == "-tile-vertically")
{
	this.tileWindowsVerticallyToolStripMenuItem_Click(null, null);
}