What I do with widows and orphans is I edit the eBook's body CSS style to make sure windows and orphans areboth set to 1.
Code:
body {
widows: 1;
orphans: 1;
margin-top: 0;
margin-bottom: 0;
margin-left: 0;
margin-right: 0;
text-align: justify;
}
That's what I usually use unless there's a reason for different coding like font-family.