All my non-cutaway guitars have their strap buttons in the meaty part of the treble side of the heel. All my cutaway guitars have their strap buttons in their heelcaps. Why? Because a button on the treble side of the heel is in the way if you play way up the neck, and that's what cutaways are meant to allow you to do.

I've never had any problem with a guitar with a strap button in its heelcap wanting to pitch forward or roll away. First, it would have to find its way off the natural shelf provided by my no longer svelte abdomen before it could do any pitching or rolling.