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@clients = (
    { MAC => $mac, RSSI => $rssi, SNR => $snr }, /* 0 */
    { MAC => $secondmac, RSSI => $secondrssi, SNR => $secondsnr }, /* 
+1 */
    /* etc */
);

%client_0 = %{$clients[0]};

my @clients;

...

# Or setting individual bits
$clients[0]->{MAC} = $mac;