For many high achieving students their state flagship is a safety school. For my oldest UMass Amherst and UVM were both pretty much safeties.
We live in New England, and therefore relatively close to eastern Canada. In Canada (and pretty much everywhere outside of the US) admission is relatively predictable and is based on grades and test scores and references. Therefore for us anything in Canada was a safety (and the top ones were matches also). This should be true for you also. For my two daughters taken together this included McGill (obviously very highly ranked to be called “safety”), and the four top ranked small primarily undergraduate schools in Eastern Canada (the closest thing that Canada has to what we call LACs): Mount Allison, Acadia, St Francis Xavier, and Bishop’s. If you prefer a small campus, these last four would be good choices. Acadia is hilly, which might or might not be an issue. Bishop’s is closer and a bit more contained in terms of size and hills.