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I am not sure whether it is a good idea to use an SMD component for one of the two connectors. Connectors are exposed to a lot of physical stress in particular when plugging in and out. Through-hole connectors are more robust with respect to this kind of stress.

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In this case the DB9 connector is not just surface-mounted, as it sits on the board edge so the force when inserting it will be taken by the board, and the surface-mounted solder points are at both sides of the board so the pull force will not cause bending as it would in a plain surface-mounted connector.

My hunch is that all that makes up for it. I would be very surprised if it breaks off. I’m however not an expert beyond having repaired several surface-mounted connectors that broke off in my own computers.

One connector is THT and the other is soldered to the PCB via its pins

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