I use a DJI Osmo Mobile 2 with my iPhone.
If you want an example of the kind of video I get with it, view here:
I know the above teaches digital video, but a gimble isnt needed with a GoPro Hero 7 black, unless you are after perfection- here is a video I shot with it, no gimble required, one error I did make was not setting it to the correct frequency for Lanzarote electricity so some of the lights flicker (easily remedied if I had realised).-
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