Be aware that you're obstructing the offside rear lights and it looks like a mountain bike would obstruct the nearside rear lights as well, you're fairly unlikely to get pulled for it, but if you're involved in an accident it can cause all kind of problems.
I had a fairly major issue with a rear carrier that was not obscuring the lights, but was after an accident, I was lucky that the car was comprehensively photographed at the scene and i could demonstrate that the carrier had moved over the lights during the accident, but I would strongly advise using a lightboard with that rack.
Is it possible to put the bike on verticaly on these racks?

Could help it a bit....
