Thank you all for your answers guys! Thanks to corrigin for the links.
I`ve never heard about this "On Jeppesen charts, all MORA altitudes which are 6,000 feet or lower have an obstacle clearance of 1,000 feet. If the MORA altitudes are 7,000 feet or greater, the obstacle clearance is 2,000 feet." Very interesting in fact!
I thought it was only about lower or greater than 5000ft!
And it is not mandatory to have increments of certain 1000ft or 2000ft, it can be 1200ft,1600ft,2100ft, it will depend ... That`s it?
Just to make sure that I've understood everything that you all said!