Eurocamp
Here's one of the pre-erected tent camping companies in Europe: no doubt there will be loads of others (you can even camp in Florida with these people!):-
Eurocamp | Self Catering Mobile Home and Family Camping holidays in Europe
It was not clear from your first post if you want to move around or stay pretty much static; that is the obvious downside of these pre-erected tents, although I think some companies offer two centre vacations.
I've heard good things about Eurocamp over the years (they have been around quite a while), but never used them personally.
BTW, both Lidl and Aldi are German companies, and they both have a strong presence in the UK, and, no doubt, lots of other bits of Europe.
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Dave
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