Thru-hull is the way to go but if you're trailering make sure you will not screw it up putting on & off the trailer.
Shoot-thru is second best, speak with the mfg of your boat & they can tell you if it will work with your hull & if so, where to mount it. I went with the Airmar one that adjusts for angle of the mounting surface & you fill it up with mineral oil, can't remember model # + I never lose my reading at any speed.
Transom mount - last resprt. I've seen too many kick loose + several break off.
Good luck.
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