You must connect them in stereo, mono will make the Amp fault.  See this link:

https://support.sonos.com/s/article/4730?language=en_US

Rock Monitor speaker 60-SM  has two channels of left and right, how can I do the termination of these speakers with Sonos amp?

Page 3. Fig 5 of the manual.  Stereo input. 

However, given that those are 2 channel stereo inputs to a single speaker, you can only connect 2 (4 channels total) to a single Amp.  

They are reasonably efficient so the Amp should rive them well. 

As other’s have said wire them up just as you would two pair of mono speakers. Each channel wired in parallel to each speaker.

https://www.paradigm.com/en/outdoor-speakers/rock-monitor-60-sm

Hi All,

i am really confusing can you share with me, how is the wiring diagram 4 speakers to a 2 channel amp? 

Two sets of wires from the speakers to each channel of the amp, In parallel. Make sure to keep the plus/minus red/black wires together.

Speaker 1 Right to Amp right.

Speaker 2 Right to Amp right.

Speaker 1 Left to Amp left.

Speaker 2 Left to Amp left.