Dolby Atoms av receivers are available in the following configuration

5.1.2 (That means 5 speakers, one subwoofer and two ATMOS SPEAKERS)
5.2.2 (Means 5 speakers, two subwoofers and two ATMOS SPEAKERS)
5.2.4 (Means 5 speakers, two subwoofers and four ATMOS SPEAKERS)

Brands that deal with Dolby Atoms are YAMAHA, DENON,        PIONEER, ONKYO, and MARANTZ
Most of the receivers are WIFI ENABLED
On which you can update firmware released by the respective companies like mobile phones
On your hand to enable the latest file format support

Dolby atmos receivers require Dolby atmos speakers for producing the result to you
There are two types of speakers 

1. DOLBY ATMOS OVERHEAD SPEAKERS
2. DOLBY ENABLED SPEAKERS

DOLBY ATMOS OVERHEAD SPEAKERS
These speakers are unlike others speakers have specific dimension and construction to
Give you the required result, best atoms overhead speakers comes with tilt able tweeter
Inside that gives direction on higher frequencies delivered.

DOLBY ENABLED SPEAKERS
These speakers are placed above the tower speakers or front speakers that basically works on
Reflection. However loss on reflection is inevitable by absorption of the ceiling material used.

AV Receivers we use is signal driven and the maximum energy to be transferred to the drivers (speakers) where
Ever we install, copper is the best conductive material for better efficiency, we recommend
Best speaker cable with better specification for ultimate experience.

Dolby atmos installation is very crucial compared with normal 5.1 system installation,Speaker placement, calibration, crossover setting place crucial role in installation.