occasionally we used two awnings when our daughter turned up. mid weekend. it was a small porch one that fitted in a clear space on other side, to be used as a sleeping compartment. [2 berth van] while leaving the main awning as was.
must say it worked very well. although sometimes we had to pay double awning fees [if there were any] on site. for the days it was up. it is also a good idea to make enquiries of the site when booking. we have never been refused but as Sir WC has said there would only be a problem. if the site had narrow pitches.
although if you tell them, chances are they would put you on a corner plot or end of row .