to connect directly to router in AiMesh setup, I think you'll need tri-band router
BTW, i get 300-400Mbps(DOWN) 30-40Mbps(UP) on nodes to ISP and 800-1100Mbps local, 1080p HD 29-30fps streaming is only 4-6Mbps and 15-25Mbps for 4K
for local streaming node to media bridge you should be fine with 30+ cameras ... to your NVR
but for internet upload you likely to hit your ISP limit first if you stream at full HD/fps and live