Just like this, but without the light board. https://www.thule.com/en-gb/bike-rack/towbar-bike-racks/thule-rideon-3-_-9503
Clamps onto a standard tow ball (because European) with a 19mm wrench
I don’t use it any more, but otherwise it works great. I’ve carried three heavy fat bikes before now on it
$0, to a deserving person!