They are specially annoying when I need to upload to the server a web solution.
Is there a way of configuring SVN to create the _svn folders outside my working directory
In TortoiseSVN, you can right click on the working copy and drag it somewhere else. And when the popup menu appears, select "SVN Export Here". (This requires that all code in the working copy was checked in since the export will be from trunk and not from the working copy)
See these resources for details: