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The performance of multiple reconfigurable intelligent surfaces (RISs)receives limited attention in previous studies. This article fills thisresearch gap by investigating the capabilities of multiple RISs in real-worldnetworks. We propose a simplified yet highly scalable sandwich architecture forimplementing one-bit unit cells, with the flexibility to accommodate multi-bitunit cells. To effectively control multiple RISs, we present a cost-effectiveremote-controlling scheme and develop a cloud-based RIS management system.Through a series of four field trials, we demonstrate the effectiveness ofmulti-hop routing schemes in establishing reliable links. Our experimentsreveal significant improvements in signal strength and data transmission inmulti-RIS-aided Wi-Fi and commercial 5G networks. Furthermore, we investigatethe power scaling law of RIS-aided beamforming and provide insights into theroles of the later nodes in multi-hop relay chains.

Multi-RIS-aided Wireless Communications in Real-world: Prototyping and Field Trials