Try this link to Ford parts, the E trailer versions appear to already have a connector wired to the controller end, assume this why they are pointing you toward a specific type controller, the version from Ford should be only bare wires at the controller end with a wiring diagram supplied, match that diagram to any brand controller you buy. This type is often supplied with pickups, they are easy to install.
2016 Ford F53 Trailer Brake Control Harness | FordParts.com
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