What AP to use for mesh network with Pepwave Surf SOHO?

Hello! I recently purchased a Pepwave Surf SOHO but i realize its range does not cover my backyard. I would love to purchase mesh APs and disable WiFi on SOHO and just use the mesh for Wifi. I looked at this Wi-Fi Mesh Support: Overview and Howto but I am puzzled by which AP will be best useful for my use case.

Has anyone done a Wireless mesh described above for outdoor use? If so, what AP did you use? Thank you so much!