Guidance on Setup

Very unsure how I would setup with my current setup Asus Router with 2 mesh nodes setup. I need all 3 because of the house design to get full coverage. How would mesh work going forward? Asus 2g IoT. Isolated. Example 192.168.101.1 Asus 5 g IoT. Isolated example 192.168.102.1 Asus 5 g guest isolated example 192.168.103.1 Asus 2 g guest isolated example 192.168.1.104.1 Asus 5 g 192.168.1.10 Asus 2 g 192.168.1.10 Then about 20 hardwired devices not isolated they call all see each other hardwired. Example 192.168.1.10 How can I integrate the firewalla and still take advantage of all the features. I don't think I can change all my mesh to bridge as I still need the shared mesh