As per Aravona's comment, this is a firebug (Pyrrhocoris apterus).
According to Wikipedia, they are not dangerous and nothing to worry about. German version has way more info about this than the English one.
Also, they seem to be very common in Europe and parts of Africa and Asia.
similar to the Highlands in Scotland or Scandinavian fjell
Not in Germany.
Although they share some similarities at a first glance, Scotland and Scandinavia have become two quite different landscapes due to a different history of human impact.
In Scotland (and other hilly areas in the British-Irish isles), well over 99% of the original forest was removed ...
In addition to @gerrit's answer:
If you can dispense with elevation (and in consequence also with valleys) but look for open landscapes, there are some moors, e.g. the Hohe Venn at the Belgian border or also heaths, e.g. Lüneburger Heide or Colbitzer Heide.
Disclaimer: I don't know them since I'm more a hills and forest person.
Up in the Mittelgebirge are a ...
As long as you are permitted to do the camping I would not worry too much for the boars. However, make sure that you have a wild animal to worry about more: Homo sapiens.
However, when selecting your camp site make sure that it is free of boar or other wild animal traces. Avoid places where you recognize:
dug up soil
animal tracks and paths
I'd be careful of wild pigs (boar or sow doesn't matter that much) when moving rather than when camping/sleeping: the danger is if you meet them and they are cornered. But unless you like to enter swamps and very thick brambles, and pick the blackberries only from the outside of the bramble thicket you're unlikely to stumble into their "living room", and you ...