Ok so I went through this last year. I was sooo worried about the 14 Pro Max weight too... I actually tried the Ulanzi ST-28 Magnetic Tripod Mount because it's CNC aluminum. It has the 1/4"-20 thread you need and handles the landscape/portrait shift well for Reels. It's a decent option and seems sturdy for heavy use, idk if it's the absolute best but it works! (at least for me)

Yo, honestly, I was kinda disappointed with the Moment MagSafe Mount with Cold Shoe. For the heavy 14 Pro Max, it's just not as secure as expected. • SmallRig MagSafe Tripod Mount Adapter for iPhone: Strongest magnetic grip (2.5lb pull), basically perfect for landscape/portrait shifts.
• Peak Design Mobile Tripod with SlimLink: Great build quality but unfortunately over your $60 limit. Go with SmallRig... it's literally half the price and holds tighter. 👍

For ur situation, safety is everything. • Background: Large phones like the 14 Pro Max need high-strength magnets to prevent micro-vibrations during heavy use.
• Why it matters: If the grip is weak, ur long exposures will blur and 4K footage will jitter. • Solution: Check out the NEEWER Magnetic Tripod Mount for MagSafe. It’s only $20-$25 and fits ur Manfrotto perfectly. The magnetic pull is honestly stronger than most 'premium' brands... flipping it for Reels is a breeze too. dont worry, it wont fall! gl

This ^

^ This. Also, I have to politely disagree with the idea that any of these basic mounts are truly 100% safe for a heavy 14 Pro Max. Honestly, I am a big DIY person because I have seen too many of these 'secure' magnets fail in the field when things get real. It totally reminds me of a trip last year with my cousin. He had a mount that was supposed to be the strongest on the market. We were out on a windy cliffside trying to get some long exposures, and he kept saying how solid it felt. Well, he went to swap it to portrait mode for a quick Reel and the torque just totally overwhelmed the grip. I watched his phone wobble like crazy and he had to dive to catch it before it went over the edge. We spent the next three hours trying to rig up a safety tether using some paracord and zip ties I had in my trunk just so he could finish his shoot. It was a massive headache and we basically missed the entire sunset while he was fussing with it. Just be careful and maybe think about adding your own reinforcement... I never trust factory specs when my expensive gear is on the line.

Ok so looking at the advice so far, the consensus is basically choosing between high-pull magnetic strength and the premium build quality of aluminum mounts. As an enthusiast who prefers a DIY approach for better security, I have to say I am way more cautious than most. I have seen too many heavy phones take a dive because people underestimated the kinetic energy during a quick transition between portrait and landscape. In my own experience, I actually stopped relying solely on the magnetic connection for my 14 Pro Max. I modified my current setup by adding a custom-made safety tether and a secondary tension screw. It might sound like overkill, but the sheer weight of these Pro Max models creates a lot of leverage. I learned that while the magnets are great for convenience, they dont always handle sudden shocks well. If ur going to be out in the field, I definitely recommend looking into some DIY fail-safes. Adding a small lanyard or a custom-fit bracing clip can give u that professional level of reliability that off-the-shelf parts sometimes lack. Honestly, its sooo much better to be safe than sorry when ur mounting such an expensive piece of glass.