aimesh alternative

Hi! I've two Asus Routers: RT-AC3100 & RT-AC66U_B1. Both with Asuswrt-Merlin firmware. These are wire connected with AiMesh config. The AC3100 is configure as AiMesh Router, connected to my Internet Provider Cable-modem, have attached a WD USB3 1TB HDD where is installed Entware some tools and...