I get the odds on Odds Portal now, for NHL. I now understand why they have 2.x odds on both teams, because with the third option for x (overtime / penalty shootout) to win, if you placed an even bet across all three, you can absolutely lose. You can't use those odds though if only listing the teams to win, you must include the other for the win, as when x occurs, neither team won outright, thus x odds kick in.
On some games you can absolutely get lucky for spread betting and win, but if you spread on each game, you would lose massively overall, thus it works when using the triple combo method from odds portal.
Again though, if only listing an outcome for the win each, then those odds wouldn't work, because most of the time you couldn't lose with both teams having 2.x odds.