I have one that I am currently using because I am working abroad and it was easier to ship out than my preferred tow bar rack. It’s over ten years old but basically the same design as the one you have linked to, although it doesn’t have the quick releases on the bike mount. I have fitted it to a booted (not hatchback) Mitsubishi Lancer and a VW Touareg.
Overall it works. But…..
1. I don’t like the weight of 3 bikes on it. 1 is good, 2 is OK. But I end up looking in the rear view mirror a lot.
2. You really have to make sure the straps to the car are done up tight and re-tension them once the bikes are on the car as the weight tends to unload the bottom straps.
3. You are best off with some decent straps to secure the bikes. I use some Thule ones which are like the Halfords’ ones in the link but heavier duty.
4. There is nothing really to keep bikes apart when you have more than one on there, so be prepared for some scratches or trying to wrap blankets, etc between bikes. Even then there is usually some movement of the bikes on the rack and you can lose the paint on the bottom of your top tube.
5. The bikes (or parts of them) sit above the car roof line so there is a fuel penalty.
In sum, OK for what it’s supposed to do as a budget option, with some limitations, but I’m not comfortable with more than 2 bikes on it.