Using react-hook-form with @mui/x-date-pickers v6

With MUI X v5 Date Pickets I used to do the following to register the input with react-hook-form

<DatePicker
    ...date picker props
    renderInput={(params) => {
        return (
            <TextField
                {...params}
                ...other text field props
                {...register("startDate", { required: true })}
            />
        );
    }}
/>

Now with MUI v6, the renderInput method is not present so I tried the following:

<DatePicker
    ...date picker props
    slotProps={{
        textField: {
            ...text field props,
            {...register("startDate", { required: true })}
        }
    }}
/>

Haven't been able to find a lot of documentation around this? Any help would be greatly appreciated.

I was able to get this working using a Controller

<Controller
    name="startDate"
    control={control}
    rules={{ required: true }}
    defaultValue={null}
    render={({ field }) =>
        <DatePicker
            {...field}
            ...date picker props
            slotProps={{
                textField: {
                    ...text field props
                }
            }}
        />
    }
/>

If anyone has another way to get this working without using a Controller please let me know.