Are you a senior applying this year, or are you asking for the future?
You can’t. They don’t offer ED.
Why? Many of them aren’t even the top CS schools
You can submit an “outside” LOR like this only at some schools. You still need two teacher LORs at most.
This list is empty? That’s very worrisome.
To answer your main question: acceptance rates are very low at all these T25s as I’m sure you know. So none of them are a sure thing for you.