I bought a phone mount one, it charges quite fast and it is so much easier to place my phone in the dock and have it charge. It does get quite warm but that's easily remedied by pointing an AC vent to the back of the phone.
Honestly it sounds like you got a low wattage one and yes those do charge much slower.
As much as I don't like him, he was supposedly donating starlink equipment to help with connectivity in the area. I'm sure it comes with a host of caveats and gotchas but it's something at least