Create own ruleset for codesniffer PHPCS

Question

I am trying to create my own ruleset for PHPCS extending the WordPress standard. My goal is to define that a opening brace starts as the same line as the function name.

    public function __construct() {

        self::$instance = $this;
    }

So I added this to my ruleset

    <rule ref="Squiz.Functions.MultiLineFunctionDeclaration">
        <properties>
            <property name="opening_brace" value="same"/>
            <property name="closing_brace" value="next_line"/>
            <severity>5</severity>
        </properties>
    </rule>

But the sniffer still shows me the error:

Opening brace should be on a new line (Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine)

I just found this codesnippet, but I have no idea how to find the correct propertynames. How do I get the correct rule + property and value?