Priefert HG91 headgate mounted to GOOD wooden posts or (better) steel posts, or (easier but more expensive) to a Priefert headgate stand will work, but even with the headgate stand, you will need to plant at least some good teeposts along each side of the stand. I used one just like that without a squeeze for several years and it worked fine.
Headgate stand alone will run you over $400 but you can make one cheaper than that.
https://www.nrsworld.com/priefert/priefert-headgate-stand-141454
https://www.youtube.com/watch?v=_6FjUiNp2Ns