Standard 1/4 inch screws fit most, but be careful with cheap plates.

• K&F Concept 64 inch Aluminum Tripod is solid for Zion wind.
• SmallRig Selection Aluminum Tripod is lighter but might wobble.

Quick reply while I have a sec! You totally need something sturdy for that G9II. Check these two options:

• Manfrotto Compact Action Aluminum Tripod with Hybrid Head
• The joystick grip is amazing for speed. It is very intuitive but has a lower weight capacity.
• Neewer 66-inch Aluminum Alloy Camera Tripod with 360 Degree Ball Head
• This is fantastic value because it converts to a monopod for hiking. Both fit your mount perfectly!!

Congrats on the G9II, its a beast but yeah, it definitely has some heft. For a place like Zion, you really want something that wont tip over when the wind picks up. I learned that the hard way. I grabbed a really cheap tripod once thinking it would be fine since it was rated for the weight. Well, as soon as I got out there, the head started drifting and my shots were all blurry from vibrations. It was super frustrating and I almost dropped my setup. About the plates, most things use Arca-Swiss now which is universal, but some budget options use proprietary plastic ones that are honestly kind of scary. I ended up upgrading because I didnt trust cheap plastic locks with expensive gear. My advice is to check weight ratings carefully and maybe look for an aluminum build for better stability.

Regarding what #3 said about "Quick reply while I have a sec! You..." - honestly, the struggle is real. Finding a tripod that respects the technical requirements of a heavy body like the G9II for under $75 is just... exhausting. I've been looking at the specs for the Joilcan 80-inch Tripod for Camera Aluminum vs the Zomei Q666 Lightweight Travel Tripod and both have major trade-offs that make me nervous. The Joilcan has a high max height, but the tube diameter in the lower leg segments is way too thin for a heavy micro four thirds setup. It wont hold steady if there is even a light gust in Zion. Tbh, the vibration dampening is basically non-existent. Then you have the Zomei Q666, which uses a standard Arca-Swiss plate—that answers your mounting question—but the ball head tolerances are poor, leading to creep where the camera slowly tilts down after you lock it. Its basically a nightmare when you're trying to frame a shot perfectly. Ngl, comparing these two just shows how much you lose at this price point. One gives you height but lacks torsional rigidity, the other gives you a better mounting system but a weak locking head. It is so frustrating that everything in this budget feels like a compromise that might eventually fail and put your gear at risk... its just a mess.