In my experience there are no issues with TS level clearances and re-investigations with reasonable amounts of (vanilla) foreign stock holdings. If you think about it, those people are trying to find the next Edward Snowden or people who have "Fat Leonard" style skeletons in their closets that can be leveraged by a foreign power. Even if they ever look at a brokerage statement, they will be confused by the ".TO" written after the stock symbol, they will glance at the amount and see it is not a big deal, and move on.
Jared Kushner you are not.
As far as an investment, the trading fees can vary widely on different exchanges depending on your broker so just do your homework.