Those Decathlon tarps are great. I used mine a couple of weeks ago when camping and it chucked it down and blew a gale It took a minute to just pop up with one pole to shelter us for the heavy pours and not much longer to pop up with both poles so we cold cook under it. It was quite windy and sadly one of the poles got pulled through it`s eyelet but that was my fault for not dropping it
The downside of it is the size and weight with the poles included but for £20 you can`t go wrong.
Top tip is to mark the poles with tape then you can whip them together and they both are the same length