To add a bit of balance I’ve got an identical one to the one you posted and I’ve had no issues with it. The coach bolt supplied wasn’t long enough to allow the clamp to fit around most alloy downtubes so I had to fit a longer bolt, and the guide rail won’t fit huge volume tyres very well i.e DH bikes. With everything tightened up and a few straps it seems quite secure.
You need to use your noggin though and actually check it regularly and give it a good look to make sure your bike is on there solidly and isn’t going to come off. I’ve never had a bike rack fail or a bike come off in the 8 or so years I’ve been using one because I use them properly, 9 times out of 10 bikes coming off racks of any quality are down to user error. Even if something fails on a rack you should have seen damage/cracks or bended bits if you’d actually looked before using it.
But, like the other’s said if you want complete peace of mind and something you know you’ll probably never have any problems with spend a bit more and get a thule/pendle/whatever.