I would be reluctant to require an in-person presence.
We have very large electoral districts in Canada. They are probably some of the largest in the world, if not the largest. Nunavut, to take an example, is almost two million square miles, and communications across the riding are very limited. That creates a range of challenges for candidates and elected MPs. In large districts, requiring someone's presence at the office of the returning officer, even where we have satellite offices, may present challenges for some of the candidates.
That's not something that I have considered, just to be clear.