I would just dab a bit of liquid rosin on them and touch them with a soldering iron and maybe the slightest tap of molten solder on each one. They will wick the solder down in to the connector via capillary action.
If you do not have a desoldering tool or the technique you can mess up a pad or delaminate the trace from the PCB.
Those grounding ears on either side are important to get soldered down. That is the mechanical rigidity of the USB connector and every time you bump the external USB cable you are putting stress on the connector. I have a $2000 laptop that is junk because the USB-C connector tore off that way.
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Tisha Hayes, AA4HA
Sr Engineer, 4RF Inc.
Tisha Hayes, AA4HA