  This paper suggests the use of multiple distributed intelligent reflecting
surfaces (IRSs) towards a smarter control of the propagation environment.
Notably, we also take into account the inevitable correlated Rayleigh fading in
IRS-assisted systems. In particular, in a single-input and single-output (SISO)
system, we consider and compare two insightful scenarios, namely, a finite
number of large IRSs and a large number of finite size IRSs to show which
implementation method is more advantageous. In this direction, we derive the
coverage probability in closed-form for both cases contingent on statistical
channel state information (CSI) by using the deterministic equivalent (DE)
analysis. Next, we obtain the optimal coverage probability. Among others,
numerical results reveal that the addition of more surfaces outperforms the
design scheme of adding more elements per surface. Moreover, in the case of
uncorrelated Rayleigh fading, statistical CSI-based IRS systems do not allow
the optimization of the coverage probability.
