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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
Ringke
Ringke's two-card holder attaches to a flat phone case with replaceable 3M adhesive and does not depend on model-specific magnets.
Attach to a smooth compatible case or use the recommended protective film on glass; remove before wireless charging when it interferes.
Sinjimoru
Sinjimoru specifies its flexible adhesive pouch for smartphones with enough flat rear area, independent of the phone connector or magnet system.
Use a smooth case or supplied adhesion film on glass; verify the pouch does not cover the camera and remove it if it obstructs wireless charging.
Open the evidence, limitations, and model identity for a single accessory.