With such constraint (i.e. the small, low profile), I guess you are limiting your options quite a bit. I avoided all the adapters I saw having an antenna, and so I ended up with a few differently branded usb wifi adapters, still mediatek (newer chipset) (and still with many people reporting instabilities, kernel panics etc). Which leaves the following two-three which are also the last resort I suppose. Try to gather some info on the:
- Edimax EW-7811Un Wi-Fi USB, or
- Edimax AC450 Wi-Fi USB Adapter-11ac Upgrade for MacBook if still available, or
- Edimax EW-7822ULC (recent, and fast)
But since I have zero experience with them, I cannot endorse that they will come without issues. That said, they are advertised as macintosh compatible adapters, so they should work fine in theory, dear @Hifihedgehog.