10A is not much. You can easily use 3-5 pins of a standard 100mil header for this, or choose from other SMT connectors. If the board is top single-side SMT, you can get through-board female headers and let the male side (which is soldered to motherboard) poke through your converter PCB.
I use Amphenol D-sub connectors on my test jigs. Contacts are rated at 3A each, so a high-density 15-way connector can handle a lot of current, in principle.
For some prototyping and one-off applications, I drill out the connector shells at the screwlock holes. The shells then separate, making the contacts (through-hole
male and female) available as loose parts. The loose parts are useful when you want to make low pin count, board-to-board connections, and don't
have room for the full connector shell.
OP is designing a product, though (in quantity?). So if there is room for the shell, and a through-hole style connector is ok, I'd at least consider a HD
15-way D-sub. Cheap and effective.