As you said, high grades and test scores are required. This shouldn't be a problem(?), and they'll get admission bonus points being from the state that gave birth to the first two prophets of the restoration.

It may also hinge on their anticipated majors.

Two advantages of USU--being an alum, my children will get in-state tuition (making BYU & USU a push in this regard?) and both my wife and I have a lot of friends in Cache Valley which provides us with some comfort with the kids being 2,000 miles from home.