Before going on the Munich-Venice tour, I was thinking of getting a GoPro Hero 7. However, decided against it for price and tried to get it all by phone.
I don't want to publish these videos or edit them. I just want to keep mementos and the phone was perfectly adequate. I didn't have a mount. I would capture video by hand while riding.
If I were to do it again, I might get a phone mount that allows some hands-free capture but other than that, it was a perfectly workable solution without a specialized action cam