Re: simple bike holder in the back for 2 pieces for combi
Sorry can't help you with sourcing, but I have this sort of thing and it's fine for two adult and one child bike up to motorway speeds, and on bumpy-ish roads at low speed.
It depends very much on the vehicle though - I have an S-Max which has a very solid rear door with metal frame. Take a look and see if you fancy your chances hooking onto the edges of yours - if you wouldn't be confident, then don't.
It's also a bit of a pain to get them on - I can never remember which angles they all go at to avoid pedals and handlebars jamming.
I'll probably be upgrading to a tow-hitch one - you can open the boot, it's much easier to put the bikes on, and I need to do four which I wouldn't try on the current one even if the bars were long enough.
In German it's a Fahrradträger.