OP I have tried your tactic yesterday: 2 bets won, 1 lost ... so very good. I have never tried mutual betting before, it's kind of fun.
I have won on NBA - Miami vs GSW:
https://www.onehash.com/event/basketball/nba/16738 Odds were x 7,35 and Pelicans won against Cavs x 4.281
It would be nice to have option to sort events by highest odds. Do you think this is possible? I send request by mail to them

I see that today there is Copa del Rey game: Alaves vs Alcorcon odds for now - x 14.938
Alaves won previous game 2:0, so Alcorcon will pressure to win and it's possible that they will win 0:1
What do you think ?