I bought an add-on USB-C 'magsafe' adapter when I bought my 2017 MBP 13" [1]. I had planned to leave the one bit in the laptop, and use it like a magsafe, but it didn't work out well - it wasn't as magnetic or as positive in location as a real magsafe (it tended to fold 'sideways' too easily), and in the end I just stopped using it because it became more of a pain than the real risk of it getting dragged off a table (the only location I used to use it was at my girlfriend's house in the kitchen and I took to just taking the cable out when I walked away to save the kids having a nightmare).
Snapnator actually delivered for you? I know several people including myself that had bought one of these things and never had them delivered, then never had any support requests answered. I had put them down to a large scam.
