I have an arrangement on my Mavic Air that may satisfy your needs:
First, there is a bracket that clips on to the top of the
MA and has a thread to which you can attach a GoPro (or anything else, using Dual Lock) to the top:
Amazon.com : LEMONPET for DJI Mavic Air Drone Multifunction Adapter Bracket Holder with Screw, Mount 360-degree Rotatable Action Panorama Camera / Gopro Sport Camera : Camera & Photo
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If you want one where the GoPro attaches to the bottom, you might want to try something similar, which clips onto the bottom
Buy Drone Start Mavic Air Accessories Finger Guard Board Hand Dam-Board for DJI Mavic Air: Aircraft Landing Gear - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
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Note that when you assemble it, just don't put on the snap-on finger protectors, if you don't want them. The kit includes the camera mounting hardware. I don't have a GoPro, but I use the bracket only to hold the Firehouse ARC2, attached with Dual-Lock, facing down.
If you attach to the bottom, you're right about needing increased ground clearance
Here's the first one that I got, which provides a ground clearance of 1.38"
Amazon.com: KUUQA Landing Gear Leg Height Extender Kit Riser Stabilizers Compatible with Mavic Air: Toys & Games
www.amazon.com
For more clearance (1.8"), I bought this one.
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At present, I don't need all the clearance the higher set provides, so I use the shorter ones, to save weight.
Nice thing about both of these is that the front extenders attach to the motor and antenna, leaving almost all of the arm available for other accessories, like prop guards, or Aero Pixel clip on strobe holders (I have a forward facing holder on one side, and an aft facing holder on the other side, using red and white ARC2 strobes, respectively).