I'm not very familiar with extenders or mesh systems.  I received a testimonial and read the reviews on the DECO and ordered the M5.

I intended to purchase a set of 3 DECO M5s.  However, I apparently ordered only one.  I feel I need at least 3 to get the coverage needed throught the house..  Are all units identical?  If so, I'll simply order 2 more.  If not, I need to retrun the single unit and order three units.  

Thank you in advance for your response.