Hope I understood what you are after. I think Footer stacks stick where ever you put it on your page. Put it at bottom of your page in edit mode and it should ‘stick’ there without Sticky content stack. As it is responsive stack it should work fine with pad/phone. If content overflows, what comes to mind is that perhaps there’s a lot of content or might need to check Fill mode in Inspector.
If you have an example of what you’re looking to do, as well as a link to your page showing your current footer, we could probably offer suggestions, or at the least explain what is going on.